diff --git a/CMakeLists.txt b/CMakeLists.txt
index c832d701d..6da319aa0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2007-2008 Julien Louis <ptitlouis@sysif.net>
-# Copyright (C) 2008-2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2007-2008 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2008-2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindAsciidoctor.cmake b/cmake/FindAsciidoctor.cmake
index 576402aba..dd8107f6a 100644
--- a/cmake/FindAsciidoctor.cmake
+++ b/cmake/FindAsciidoctor.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindAspell.cmake b/cmake/FindAspell.cmake
index 80b74f075..c43c6c129 100644
--- a/cmake/FindAspell.cmake
+++ b/cmake/FindAspell.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindCppUTest.cmake b/cmake/FindCppUTest.cmake
index 1f841b3b9..d72ca65f2 100644
--- a/cmake/FindCppUTest.cmake
+++ b/cmake/FindCppUTest.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindENCHANT.cmake b/cmake/FindENCHANT.cmake
index 24c3ae683..2ded12298 100644
--- a/cmake/FindENCHANT.cmake
+++ b/cmake/FindENCHANT.cmake
@@ -6,7 +6,7 @@
 #  ENCHANT_LIBRARIES - Link these to use ENCHANT
 #  ENCHANT_DEFINITIONS - Compiler switches required for using ENCHANT
 
-# Copyright (c) 2006, Zack Rusin, <zack@kde.org>
+# SPDX-FileCopyrightText: 2006 Zack Rusin <zack@kde.org>
 #
 # Redistribution and use is allowed according to the terms of the BSD license.
 # For details see the accompanying COPYING-CMAKE-SCRIPTS file.
diff --git a/cmake/FindGettext.cmake b/cmake/FindGettext.cmake
index 3b2aa4c8b..1ceda9788 100644
--- a/cmake/FindGettext.cmake
+++ b/cmake/FindGettext.cmake
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2007 Julien Louis <ptitlouis@sysif.net>
-# Copyright (C) 2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2007 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindGuile.cmake b/cmake/FindGuile.cmake
index 2528f4a29..1d07673c2 100644
--- a/cmake/FindGuile.cmake
+++ b/cmake/FindGuile.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindIconv.cmake b/cmake/FindIconv.cmake
index b243bd8e3..895ebd05a 100644
--- a/cmake/FindIconv.cmake
+++ b/cmake/FindIconv.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindLua.cmake b/cmake/FindLua.cmake
index b1a55ec29..3e4c1da0e 100644
--- a/cmake/FindLua.cmake
+++ b/cmake/FindLua.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindNcurses.cmake b/cmake/FindNcurses.cmake
index 134d39626..ac5b0a881 100644
--- a/cmake/FindNcurses.cmake
+++ b/cmake/FindNcurses.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindPHP.cmake b/cmake/FindPHP.cmake
index 83b91aeb1..461d6ce76 100644
--- a/cmake/FindPHP.cmake
+++ b/cmake/FindPHP.cmake
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2017 Adam Saponara <as@php.net>
-# Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2017 Adam Saponara <as@php.net>
+# SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindPerl.cmake b/cmake/FindPerl.cmake
index 3750639c0..9a090dfac 100644
--- a/cmake/FindPerl.cmake
+++ b/cmake/FindPerl.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindPython.cmake b/cmake/FindPython.cmake
index 03f892244..25f201bcc 100644
--- a/cmake/FindPython.cmake
+++ b/cmake/FindPython.cmake
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2009 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2009 Julien Louis <ptitlouis@sysif.net>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/FindV8.cmake b/cmake/FindV8.cmake
index 6673cc377..42af7976c 100644
--- a/cmake/FindV8.cmake
+++ b/cmake/FindV8.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/cmake/cmake_uninstall.cmake.in b/cmake/cmake_uninstall.cmake.in
index 5911e219b..3bbb8116e 100644
--- a/cmake/cmake_uninstall.cmake.in
+++ b/cmake/cmake_uninstall.cmake.in
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index ad9c7b792..b7309b869 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/doc/docinfo.html b/doc/docinfo.html
index 1297f6803..bc37f7207 100644
--- a/doc/docinfo.html
+++ b/doc/docinfo.html
@@ -1,6 +1,6 @@
 <!--
   Custom styles for Asciidoctor
-  Copyright (C) 2016-2025 Sébastien Helleu <flashcode@flashtux.org>
+  SPDX-FileCopyrightText: 2016-2025 Sébastien Helleu <flashcode@flashtux.org>
 -->
 <style>
 
diff --git a/doc/en/weechat_dev.en.adoc b/doc/en/weechat_dev.en.adoc
index 81d05b23c..a11033a29 100644
--- a/doc/en/weechat_dev.en.adoc
+++ b/doc/en/weechat_dev.en.adoc
@@ -577,7 +577,7 @@ Example in C:
 /*
  * weechat.c - core functions for WeeChat
  *
- * Copyright (C) 2025 Your Name <your@email.com>
+ * SPDX-FileCopyrightText: 2025 Your Name <your@email.com>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/doc/fr/weechat_dev.fr.adoc b/doc/fr/weechat_dev.fr.adoc
index f2735b106..f63c78c27 100644
--- a/doc/fr/weechat_dev.fr.adoc
+++ b/doc/fr/weechat_dev.fr.adoc
@@ -578,7 +578,7 @@ Exemple en C :
 /*
  * weechat.c - core functions for WeeChat
  *
- * Copyright (C) 2025 Your Name <your@email.com>
+ * SPDX-FileCopyrightText: 2025 Your Name <your@email.com>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/doc/ja/weechat_dev.ja.adoc b/doc/ja/weechat_dev.ja.adoc
index d76b504cd..1e3b15e12 100644
--- a/doc/ja/weechat_dev.ja.adoc
+++ b/doc/ja/weechat_dev.ja.adoc
@@ -701,7 +701,7 @@ WeeChat とプラグインの翻訳は gettext で行います、ファイルは
 /*
  * weechat.c - core functions for WeeChat
  *
- * Copyright (C) 2025 Your Name <your@email.com>
+ * SPDX-FileCopyrightText: 2025 Your Name <your@email.com>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/doc/sr/weechat_dev.sr.adoc b/doc/sr/weechat_dev.sr.adoc
index 3f57850c6..c5f9d9cc9 100644
--- a/doc/sr/weechat_dev.sr.adoc
+++ b/doc/sr/weechat_dev.sr.adoc
@@ -576,7 +576,7 @@ WeeChat „језгро” се налази у следећим директо
 /*
  * weechat.c - core functions for WeeChat
  *
- * Copyright (C) 2025 Your Name <your@email.com>
+ * SPDX-FileCopyrightText: 2025 Your Name <your@email.com>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/icons/CMakeLists.txt b/icons/CMakeLists.txt
index c4152ee64..a851ee1ac 100644
--- a/icons/CMakeLists.txt
+++ b/icons/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/CMakeLists.txt b/po/CMakeLists.txt
index cf0e67df5..3f3708cd5 100644
--- a/po/CMakeLists.txt
+++ b/po/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/cs.po b/po/cs.po
index 0c44c478b..95902d0da 100644
--- a/po/cs.po
+++ b/po/cs.po
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2005-2011 Jiri Golembiovsky <golemj@gmail.com>
-# Copyright (C) 2015 Ondřej Súkup <mimi.vx@gmail.com>
+# SPDX-FileCopyrightText: 2005-2011 Jiri Golembiovsky <golemj@gmail.com>
+# SPDX-FileCopyrightText: 2015 Ondřej Súkup <mimi.vx@gmail.com>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/de.po b/po/de.po
index dc12f8e5a..6cb4d7841 100644
--- a/po/de.po
+++ b/po/de.po
@@ -1,8 +1,8 @@
 #
-# Copyright (C) 2005 Rudolf Polzer <weechat-te@durchnull.de>
-# Copyright (C) 2006-2007 Thomas Schuetz <i18n@internet-villa.de>
+# SPDX-FileCopyrightText: 2005 Rudolf Polzer <weechat-te@durchnull.de>
+# SPDX-FileCopyrightText: 2006-2007 Thomas Schuetz <i18n@internet-villa.de>
 # SPDX-FileCopyrightText: 2009-2019, 2023, 2024, 2025 Nils Görs <weechatter@arcor.de>
-# Copyright (C) 2015 Sven Knurr <zeug@tuxproject.de>
+# SPDX-FileCopyrightText: 2015 Sven Knurr <zeug@tuxproject.de>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/es.po b/po/es.po
index 0c7923896..36ae07f11 100644
--- a/po/es.po
+++ b/po/es.po
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2009 Roberto González Cardenete <robert.glez@gmail.com>
-# Copyright (C) 2009-2012 Elián Hanisch <lambdae2@gmail.com>
-# Copyright (C) 2012 Quico Noizeux <keecoh@gmail.com>
+# SPDX-FileCopyrightText: 2009 Roberto González Cardenete <robert.glez@gmail.com>
+# SPDX-FileCopyrightText: 2009-2012 Elián Hanisch <lambdae2@gmail.com>
+# SPDX-FileCopyrightText: 2012 Quico Noizeux <keecoh@gmail.com>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/fr.po b/po/fr.po
index 364fa0872..60fe56b9e 100644
--- a/po/fr.po
+++ b/po/fr.po
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2005-2006 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2005-2006 Julien Louis <ptitlouis@sysif.net>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/hu.po b/po/hu.po
index 2137d1348..ccde7a110 100644
--- a/po/hu.po
+++ b/po/hu.po
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2007 Andras Voroskoi <voroskoi@frugalware.org>
+# SPDX-FileCopyrightText: 2006-2007 Andras Voroskoi <voroskoi@frugalware.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/it.po b/po/it.po
index 751a4e357..507c40352 100644
--- a/po/it.po
+++ b/po/it.po
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2009-2013 Marco Paolone <marcopaolone@gmail.com>
+# SPDX-FileCopyrightText: 2009-2013 Marco Paolone <marcopaolone@gmail.com>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/ja.po b/po/ja.po
index d4b12ed1b..24d429f9b 100644
--- a/po/ja.po
+++ b/po/ja.po
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2012-2019 Ryuunosuke Ayanokouzi <i38w7i3@yahoo.co.jp>
+# SPDX-FileCopyrightText: 2012-2019 Ryuunosuke Ayanokouzi <i38w7i3@yahoo.co.jp>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/pl.po b/po/pl.po
index 615703aef..d44fc4a71 100644
--- a/po/pl.po
+++ b/po/pl.po
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2009-2016 Krzysztof Koroscik <soltys1@gmail.com>
-# Copyright (C) 2010 B.J. Stobiecki <bartek@stobiecki.eu>
+# SPDX-FileCopyrightText: 2009-2016 Krzysztof Koroscik <soltys1@gmail.com>
+# SPDX-FileCopyrightText: 2010 B.J. Stobiecki <bartek@stobiecki.eu>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/pt.po b/po/pt.po
index 25f541f44..1a0f29a79 100644
--- a/po/pt.po
+++ b/po/pt.po
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2016 Vasco Almeida <vascomalmeida@sapo.pt>
+# SPDX-FileCopyrightText: 2016 Vasco Almeida <vascomalmeida@sapo.pt>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/pt_BR.po b/po/pt_BR.po
index 44005d832..c99e01593 100644
--- a/po/pt_BR.po
+++ b/po/pt_BR.po
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2010-2013 Ivan Sichmann Freitas <ivansichfreitas@gmail.com>
-# Copyright (C) 2011 Sergio Durigan Junior <sergiosdj@gmail.com>
+# SPDX-FileCopyrightText: 2010-2013 Ivan Sichmann Freitas <ivansichfreitas@gmail.com>
+# SPDX-FileCopyrightText: 2011 Sergio Durigan Junior <sergiosdj@gmail.com>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/ru.po b/po/ru.po
index 97e009d63..882dbe5a7 100644
--- a/po/ru.po
+++ b/po/ru.po
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2006-2007 Pavel Shevchuk <stlwrt@gmail.com>
-# Copyright (C) 2012 Aleksey V Zapparov <ixti@member.fsf.org>
+# SPDX-FileCopyrightText: 2006-2007 Pavel Shevchuk <stlwrt@gmail.com>
+# SPDX-FileCopyrightText: 2012 Aleksey V Zapparov <ixti@member.fsf.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/sr.po b/po/sr.po
index 7623e5cf3..069f269cb 100644
--- a/po/sr.po
+++ b/po/sr.po
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2024 Иван Пешић <ivan.pesic@gmail.com>
+# SPDX-FileCopyrightText: 2024 Иван Пешић <ivan.pesic@gmail.com>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/tr.po b/po/tr.po
index 5178b3c53..7bd70fe06 100644
--- a/po/tr.po
+++ b/po/tr.po
@@ -1,5 +1,6 @@
-# Copyright (C) 2013 Hasan Kiran <sunder67@hotmail.com>
-# Copyright (C) 2020-2024 Emir SARI <emir_sari@icloud.com>
+#
+# SPDX-FileCopyrightText: 2013 Hasan Kiran <sunder67@hotmail.com>
+# SPDX-FileCopyrightText: 2020-2024 Emir SARI <emir_sari@icloud.com>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/po/weechat.pot b/po/weechat.pot
index 68fcb6453..a04d364a0 100644
--- a/po/weechat.pot
+++ b/po/weechat.pot
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index bae5f8db3..30f0707d4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2007-2008 Julien Louis <ptitlouis@sysif.net>
-# Copyright (C) 2008-2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2007-2008 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2008-2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 7e767f96c..7ee506a26 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2008 Julien Louis <ptitlouis@sysif.net>
-# Copyright (C) 2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2008 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/core/core-arraylist.c b/src/core/core-arraylist.c
index 00c757602..bd43ccf53 100644
--- a/src/core/core-arraylist.c
+++ b/src/core/core-arraylist.c
@@ -1,7 +1,7 @@
 /*
  * core-arraylist.c - array lists management
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-arraylist.h b/src/core/core-arraylist.h
index f84064564..9159470dc 100644
--- a/src/core/core-arraylist.h
+++ b/src/core/core-arraylist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-backtrace.c b/src/core/core-backtrace.c
index 9c81a85ff..821ed681e 100644
--- a/src/core/core-backtrace.c
+++ b/src/core/core-backtrace.c
@@ -1,7 +1,7 @@
 /*
  * core-backtrace.c - backtrace after a segfault
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-backtrace.h b/src/core/core-backtrace.h
index a7a596a7a..fc5badb40 100644
--- a/src/core/core-backtrace.h
+++ b/src/core/core-backtrace.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-calc.c b/src/core/core-calc.c
index 73659ea46..3681f973e 100644
--- a/src/core/core-calc.c
+++ b/src/core/core-calc.c
@@ -1,7 +1,7 @@
 /*
  * core-calc.c - calculate result of an expression
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-calc.h b/src/core/core-calc.h
index 196b5f42e..d57770657 100644
--- a/src/core/core-calc.h
+++ b/src/core/core-calc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-command.c b/src/core/core-command.c
index 1cf4f6bd7..9a12ca744 100644
--- a/src/core/core-command.c
+++ b/src/core/core-command.c
@@ -1,8 +1,8 @@
 /*
  * core-command.c - WeeChat core commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-command.h b/src/core/core-command.h
index 48ef94ef5..180426a06 100644
--- a/src/core/core-command.h
+++ b/src/core/core-command.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-completion.c b/src/core/core-completion.c
index 59eb5cb34..edcefc53b 100644
--- a/src/core/core-completion.c
+++ b/src/core/core-completion.c
@@ -1,8 +1,8 @@
 /*
  * core-completion.c - completion for WeeChat commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-completion.h b/src/core/core-completion.h
index 37e1b15d6..a749489da 100644
--- a/src/core/core-completion.h
+++ b/src/core/core-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-config-file.c b/src/core/core-config-file.c
index 35cdf4bc0..52e811cb0 100644
--- a/src/core/core-config-file.c
+++ b/src/core/core-config-file.c
@@ -1,8 +1,8 @@
 /*
  * core-config-file.c - configuration files/sections/options management
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-config-file.h b/src/core/core-config-file.h
index 2f3488f3f..7cd540af9 100644
--- a/src/core/core-config-file.h
+++ b/src/core/core-config-file.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-config.c b/src/core/core-config.c
index c67dd6284..effc28c62 100644
--- a/src/core/core-config.c
+++ b/src/core/core-config.c
@@ -1,8 +1,8 @@
 /*
  * core-config.c - WeeChat configuration options (file weechat.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-config.h b/src/core/core-config.h
index 889219d3a..476eba5de 100644
--- a/src/core/core-config.h
+++ b/src/core/core-config.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-crypto.c b/src/core/core-crypto.c
index 1c8f115f6..eecb9b43b 100644
--- a/src/core/core-crypto.c
+++ b/src/core/core-crypto.c
@@ -1,7 +1,7 @@
 /*
  * core-crypto.c - cryptographic functions
  *
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-crypto.h b/src/core/core-crypto.h
index 12e4c597d..bb30578fc 100644
--- a/src/core/core-crypto.h
+++ b/src/core/core-crypto.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-debug.c b/src/core/core-debug.c
index 8afeaf255..1c180f72c 100644
--- a/src/core/core-debug.c
+++ b/src/core/core-debug.c
@@ -1,7 +1,7 @@
 /*
  * core-debug.c - debug functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-debug.h b/src/core/core-debug.h
index 7bd47fb11..c01d9e1c9 100644
--- a/src/core/core-debug.h
+++ b/src/core/core-debug.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-dir.c b/src/core/core-dir.c
index c3cd44677..2b8dda88e 100644
--- a/src/core/core-dir.c
+++ b/src/core/core-dir.c
@@ -1,7 +1,7 @@
 /*
  * core-dir.c - directory/file functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-dir.h b/src/core/core-dir.h
index 170905a96..d896f8838 100644
--- a/src/core/core-dir.h
+++ b/src/core/core-dir.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-doc.c b/src/core/core-doc.c
index 7b57e092d..de5a81d4d 100644
--- a/src/core/core-doc.c
+++ b/src/core/core-doc.c
@@ -1,7 +1,7 @@
 /*
  * core-doc.c - documentation generator
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-doc.h b/src/core/core-doc.h
index 109568ac6..6bf9129aa 100644
--- a/src/core/core-doc.h
+++ b/src/core/core-doc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-eval.c b/src/core/core-eval.c
index c670ccf46..d3f3978fe 100644
--- a/src/core/core-eval.c
+++ b/src/core/core-eval.c
@@ -1,7 +1,7 @@
 /*
  * core-eval.c - evaluate expressions with references to internal vars
  *
- * Copyright (C) 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-eval.h b/src/core/core-eval.h
index 7822e5d68..296ab742d 100644
--- a/src/core/core-eval.h
+++ b/src/core/core-eval.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-hashtable.c b/src/core/core-hashtable.c
index 8a3a7fea3..6ae0160b9 100644
--- a/src/core/core-hashtable.c
+++ b/src/core/core-hashtable.c
@@ -1,7 +1,7 @@
 /*
  * core-hashtable.c - implementation of hashtable
  *
- * Copyright (C) 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-hashtable.h b/src/core/core-hashtable.h
index d5e4b8661..986f94841 100644
--- a/src/core/core-hashtable.h
+++ b/src/core/core-hashtable.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-hdata.c b/src/core/core-hdata.c
index fd4723bfc..04b36c58a 100644
--- a/src/core/core-hdata.c
+++ b/src/core/core-hdata.c
@@ -1,7 +1,7 @@
 /*
  * core-hdata.c - direct access to WeeChat data using hashtables
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-hdata.h b/src/core/core-hdata.h
index b546d430b..873878ceb 100644
--- a/src/core/core-hdata.h
+++ b/src/core/core-hdata.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-hook.c b/src/core/core-hook.c
index 73b9fce2d..4e4b7eb03 100644
--- a/src/core/core-hook.c
+++ b/src/core/core-hook.c
@@ -1,7 +1,7 @@
 /*
  * core-hook.c - WeeChat hooks management
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-hook.h b/src/core/core-hook.h
index 9c2a14700..0e14dee93 100644
--- a/src/core/core-hook.h
+++ b/src/core/core-hook.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-infolist.c b/src/core/core-infolist.c
index a34837a8a..c38517f86 100644
--- a/src/core/core-infolist.c
+++ b/src/core/core-infolist.c
@@ -1,7 +1,7 @@
 /*
  * core-infolist.c - info lists management
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-infolist.h b/src/core/core-infolist.h
index 8f86db4d8..7c064161b 100644
--- a/src/core/core-infolist.h
+++ b/src/core/core-infolist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-input.c b/src/core/core-input.c
index ac866c114..d1a5cd99c 100644
--- a/src/core/core-input.c
+++ b/src/core/core-input.c
@@ -1,7 +1,7 @@
 /*
  * core-input.c - default input callback for buffers
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-input.h b/src/core/core-input.h
index e144c8c01..e9bb184ec 100644
--- a/src/core/core-input.h
+++ b/src/core/core-input.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-list.c b/src/core/core-list.c
index f9f9c3fe1..1bf677d95 100644
--- a/src/core/core-list.c
+++ b/src/core/core-list.c
@@ -1,7 +1,7 @@
 /*
  * core-list.c - sorted lists
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-list.h b/src/core/core-list.h
index 2db5bf57e..cffec6b06 100644
--- a/src/core/core-list.h
+++ b/src/core/core-list.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-log.c b/src/core/core-log.c
index 279a4729e..cb5436962 100644
--- a/src/core/core-log.c
+++ b/src/core/core-log.c
@@ -1,8 +1,8 @@
 /*
  * core-log.c - WeeChat log file (weechat.log)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-log.h b/src/core/core-log.h
index c7d127a5a..db81059ad 100644
--- a/src/core/core-log.h
+++ b/src/core/core-log.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-network.c b/src/core/core-network.c
index 893f6314a..ded067c50 100644
--- a/src/core/core-network.c
+++ b/src/core/core-network.c
@@ -1,10 +1,10 @@
 /*
  * core-network.c - network functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2010 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2010 Gu1ll4um3r0m41n <aeroxteam@gmail.com>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2010 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2010 Gu1ll4um3r0m41n <aeroxteam@gmail.com>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-network.h b/src/core/core-network.h
index 6d18acb2d..d9632c138 100644
--- a/src/core/core-network.h
+++ b/src/core/core-network.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-proxy.c b/src/core/core-proxy.c
index 7a362ed1b..02856da68 100644
--- a/src/core/core-proxy.c
+++ b/src/core/core-proxy.c
@@ -1,7 +1,7 @@
 /*
  * core-proxy.c - proxy functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-proxy.h b/src/core/core-proxy.h
index 5bbffb092..b4e51f005 100644
--- a/src/core/core-proxy.h
+++ b/src/core/core-proxy.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-secure-buffer.c b/src/core/core-secure-buffer.c
index 708e91c4c..6cf711a51 100644
--- a/src/core/core-secure-buffer.c
+++ b/src/core/core-secure-buffer.c
@@ -1,7 +1,7 @@
 /*
  * core-secure-buffer.c - secured data buffer
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-secure-buffer.h b/src/core/core-secure-buffer.h
index 1c7a659ca..3ca3b4744 100644
--- a/src/core/core-secure-buffer.h
+++ b/src/core/core-secure-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-secure-config.c b/src/core/core-secure-config.c
index edefd2b2a..ad67d687f 100644
--- a/src/core/core-secure-config.c
+++ b/src/core/core-secure-config.c
@@ -1,7 +1,7 @@
 /*
  * core-secure-config.c - secured data configuration options (file sec.conf)
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-secure-config.h b/src/core/core-secure-config.h
index 4777b45a2..435d3645a 100644
--- a/src/core/core-secure-config.h
+++ b/src/core/core-secure-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-secure.c b/src/core/core-secure.c
index 017852137..af60ecef3 100644
--- a/src/core/core-secure.c
+++ b/src/core/core-secure.c
@@ -1,7 +1,7 @@
 /*
  * core-secure.c - secured data
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-secure.h b/src/core/core-secure.h
index 4a2bb024d..f310cf905 100644
--- a/src/core/core-secure.h
+++ b/src/core/core-secure.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-signal.c b/src/core/core-signal.c
index 4f2ccf939..1de26d96f 100644
--- a/src/core/core-signal.c
+++ b/src/core/core-signal.c
@@ -1,7 +1,7 @@
 /*
  * core-signal.c - signal functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-signal.h b/src/core/core-signal.h
index 8167f1896..c7bf287e2 100644
--- a/src/core/core-signal.h
+++ b/src/core/core-signal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-string.c b/src/core/core-string.c
index 2d94b8617..126649bb6 100644
--- a/src/core/core-string.c
+++ b/src/core/core-string.c
@@ -1,7 +1,7 @@
 /*
  * core-string.c - string functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-string.h b/src/core/core-string.h
index b6992f9cd..33b44a6a8 100644
--- a/src/core/core-string.h
+++ b/src/core/core-string.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-sys.c b/src/core/core-sys.c
index b81b9ffb9..629ffaa4c 100644
--- a/src/core/core-sys.c
+++ b/src/core/core-sys.c
@@ -1,7 +1,7 @@
 /*
  * core-sys.c - system actions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-sys.h b/src/core/core-sys.h
index c0ab760ca..4f3fb909b 100644
--- a/src/core/core-sys.h
+++ b/src/core/core-sys.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-upgrade-file.c b/src/core/core-upgrade-file.c
index 391fe53cc..58faf1275 100644
--- a/src/core/core-upgrade-file.c
+++ b/src/core/core-upgrade-file.c
@@ -1,7 +1,7 @@
 /*
  * core-upgrade-file.c - save/restore data for upgrading WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-upgrade-file.h b/src/core/core-upgrade-file.h
index 3bb9c6982..7817077d0 100644
--- a/src/core/core-upgrade-file.h
+++ b/src/core/core-upgrade-file.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-upgrade.c b/src/core/core-upgrade.c
index 4077c5ec2..d14f60a09 100644
--- a/src/core/core-upgrade.c
+++ b/src/core/core-upgrade.c
@@ -1,7 +1,7 @@
 /*
  * core-upgrade.c - save/restore session data of WeeChat core
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-upgrade.h b/src/core/core-upgrade.h
index 432aa263a..946ce1759 100644
--- a/src/core/core-upgrade.h
+++ b/src/core/core-upgrade.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-url.c b/src/core/core-url.c
index e17c31146..d209949f2 100644
--- a/src/core/core-url.c
+++ b/src/core/core-url.c
@@ -1,7 +1,7 @@
 /*
  * core-url.c - URL transfer
  *
- * Copyright (C) 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-url.h b/src/core/core-url.h
index 90cdaa02a..b93e014cc 100644
--- a/src/core/core-url.h
+++ b/src/core/core-url.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-utf8.c b/src/core/core-utf8.c
index 1f87e8b44..05c07c0b2 100644
--- a/src/core/core-utf8.c
+++ b/src/core/core-utf8.c
@@ -1,8 +1,8 @@
 /*
  * core-utf8.c - UTF-8 string functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-utf8.h b/src/core/core-utf8.h
index 77e5bc2c5..c25d3eba2 100644
--- a/src/core/core-utf8.h
+++ b/src/core/core-utf8.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-util.c b/src/core/core-util.c
index 6a38dd9dc..3d980afe1 100644
--- a/src/core/core-util.c
+++ b/src/core/core-util.c
@@ -1,7 +1,7 @@
 /*
  * core-util.c - some useful functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-util.h b/src/core/core-util.h
index 6350d6d92..4d2f1576c 100644
--- a/src/core/core-util.h
+++ b/src/core/core-util.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-version.c b/src/core/core-version.c
index 41d5b8d4f..2f5924b5f 100644
--- a/src/core/core-version.c
+++ b/src/core/core-version.c
@@ -1,7 +1,7 @@
 /*
  * core-version.c - functions for WeeChat version
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/core-version.h b/src/core/core-version.h
index 94b09f431..b58d38488 100644
--- a/src/core/core-version.h
+++ b/src/core/core-version.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-command-run.c b/src/core/hook/hook-command-run.c
index 1f0304864..137f93133 100644
--- a/src/core/hook/hook-command-run.c
+++ b/src/core/hook/hook-command-run.c
@@ -1,7 +1,7 @@
 /*
  * hook-command-run.c - WeeChat command_run hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-command-run.h b/src/core/hook/hook-command-run.h
index 912b21c92..c011909b5 100644
--- a/src/core/hook/hook-command-run.h
+++ b/src/core/hook/hook-command-run.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-command.c b/src/core/hook/hook-command.c
index 43ae4f9ca..d1832d8fe 100644
--- a/src/core/hook/hook-command.c
+++ b/src/core/hook/hook-command.c
@@ -1,7 +1,7 @@
 /*
  * hook-command.c - WeeChat command hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-command.h b/src/core/hook/hook-command.h
index 6c242189f..e9892591f 100644
--- a/src/core/hook/hook-command.h
+++ b/src/core/hook/hook-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-completion.c b/src/core/hook/hook-completion.c
index 3ccbecf98..f88239914 100644
--- a/src/core/hook/hook-completion.c
+++ b/src/core/hook/hook-completion.c
@@ -1,7 +1,7 @@
 /*
  * hook-completion.c - WeeChat completion hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-completion.h b/src/core/hook/hook-completion.h
index 6b2450c85..cc92f6ec6 100644
--- a/src/core/hook/hook-completion.h
+++ b/src/core/hook/hook-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-config.c b/src/core/hook/hook-config.c
index b3c692354..16a7c6194 100644
--- a/src/core/hook/hook-config.c
+++ b/src/core/hook/hook-config.c
@@ -1,7 +1,7 @@
 /*
  * hook-config.c - WeeChat config hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-config.h b/src/core/hook/hook-config.h
index a3d1924ff..2d2cf8c42 100644
--- a/src/core/hook/hook-config.h
+++ b/src/core/hook/hook-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-connect.c b/src/core/hook/hook-connect.c
index 4361149b5..328e55567 100644
--- a/src/core/hook/hook-connect.c
+++ b/src/core/hook/hook-connect.c
@@ -1,8 +1,8 @@
 /*
  * hook-connect.c - WeeChat connect hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-connect.h b/src/core/hook/hook-connect.h
index 6fd3bc3f3..c58156d03 100644
--- a/src/core/hook/hook-connect.h
+++ b/src/core/hook/hook-connect.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-fd.c b/src/core/hook/hook-fd.c
index 0264ba45f..8f5a3bc90 100644
--- a/src/core/hook/hook-fd.c
+++ b/src/core/hook/hook-fd.c
@@ -1,7 +1,7 @@
 /*
  * hook-fd.c - WeeChat fd hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-fd.h b/src/core/hook/hook-fd.h
index 07e29339e..98e86f073 100644
--- a/src/core/hook/hook-fd.h
+++ b/src/core/hook/hook-fd.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-focus.c b/src/core/hook/hook-focus.c
index faeade6d0..994c3652f 100644
--- a/src/core/hook/hook-focus.c
+++ b/src/core/hook/hook-focus.c
@@ -1,7 +1,7 @@
 /*
  * hook-focus.c - WeeChat focus hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-focus.h b/src/core/hook/hook-focus.h
index abc2f06db..66317d7e4 100644
--- a/src/core/hook/hook-focus.h
+++ b/src/core/hook/hook-focus.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-hdata.c b/src/core/hook/hook-hdata.c
index 2ba1fbe45..b7a5e84cc 100644
--- a/src/core/hook/hook-hdata.c
+++ b/src/core/hook/hook-hdata.c
@@ -1,7 +1,7 @@
 /*
  * hook-hdata.c - WeeChat hdata hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-hdata.h b/src/core/hook/hook-hdata.h
index c7f1f5ec3..bb6f9ccf9 100644
--- a/src/core/hook/hook-hdata.h
+++ b/src/core/hook/hook-hdata.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-hsignal.c b/src/core/hook/hook-hsignal.c
index 24af51381..a6301a3d1 100644
--- a/src/core/hook/hook-hsignal.c
+++ b/src/core/hook/hook-hsignal.c
@@ -1,7 +1,7 @@
 /*
  * hook-hsignal.c - WeeChat hsignal hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-hsignal.h b/src/core/hook/hook-hsignal.h
index 485f4d505..e535c9b8c 100644
--- a/src/core/hook/hook-hsignal.h
+++ b/src/core/hook/hook-hsignal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-info-hashtable.c b/src/core/hook/hook-info-hashtable.c
index dbd49d35b..cd86de972 100644
--- a/src/core/hook/hook-info-hashtable.c
+++ b/src/core/hook/hook-info-hashtable.c
@@ -1,7 +1,7 @@
 /*
  * hook-info-hashtable.c - WeeChat info_hashtable hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-info-hashtable.h b/src/core/hook/hook-info-hashtable.h
index 777552d9a..868580863 100644
--- a/src/core/hook/hook-info-hashtable.h
+++ b/src/core/hook/hook-info-hashtable.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-info.c b/src/core/hook/hook-info.c
index b4f93d2dd..dda3319af 100644
--- a/src/core/hook/hook-info.c
+++ b/src/core/hook/hook-info.c
@@ -1,7 +1,7 @@
 /*
  * hook-info.c - WeeChat info hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-info.h b/src/core/hook/hook-info.h
index f7a2643ad..531e02f26 100644
--- a/src/core/hook/hook-info.h
+++ b/src/core/hook/hook-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-infolist.c b/src/core/hook/hook-infolist.c
index 269f5ab29..d4baa1c61 100644
--- a/src/core/hook/hook-infolist.c
+++ b/src/core/hook/hook-infolist.c
@@ -1,7 +1,7 @@
 /*
  * hook-infolist.c - WeeChat infolist hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-infolist.h b/src/core/hook/hook-infolist.h
index ec167a011..d740f4bbc 100644
--- a/src/core/hook/hook-infolist.h
+++ b/src/core/hook/hook-infolist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-line.c b/src/core/hook/hook-line.c
index 8b33aff11..955d62a78 100644
--- a/src/core/hook/hook-line.c
+++ b/src/core/hook/hook-line.c
@@ -1,7 +1,7 @@
 /*
  * hook-line.c - WeeChat line hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-line.h b/src/core/hook/hook-line.h
index 63112ab11..0d85ef9df 100644
--- a/src/core/hook/hook-line.h
+++ b/src/core/hook/hook-line.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-modifier.c b/src/core/hook/hook-modifier.c
index 31d19b8f1..caaa2e478 100644
--- a/src/core/hook/hook-modifier.c
+++ b/src/core/hook/hook-modifier.c
@@ -1,7 +1,7 @@
 /*
  * hook-modifier.c - WeeChat modifier hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-modifier.h b/src/core/hook/hook-modifier.h
index efc4f4e11..92937b79c 100644
--- a/src/core/hook/hook-modifier.h
+++ b/src/core/hook/hook-modifier.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-print.c b/src/core/hook/hook-print.c
index 4ca80ece9..fa758442d 100644
--- a/src/core/hook/hook-print.c
+++ b/src/core/hook/hook-print.c
@@ -1,7 +1,7 @@
 /*
  * hook-print.c - WeeChat print hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-print.h b/src/core/hook/hook-print.h
index b858e236a..c4b5f66d2 100644
--- a/src/core/hook/hook-print.h
+++ b/src/core/hook/hook-print.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-process.c b/src/core/hook/hook-process.c
index 2722c199a..acf69d723 100644
--- a/src/core/hook/hook-process.c
+++ b/src/core/hook/hook-process.c
@@ -1,7 +1,7 @@
 /*
  * hook-process.c - WeeChat process hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-process.h b/src/core/hook/hook-process.h
index be656cb1c..7f3e4325d 100644
--- a/src/core/hook/hook-process.h
+++ b/src/core/hook/hook-process.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-signal.c b/src/core/hook/hook-signal.c
index 73c3ea0ff..c7dc71d7b 100644
--- a/src/core/hook/hook-signal.c
+++ b/src/core/hook/hook-signal.c
@@ -1,7 +1,7 @@
 /*
  * hook-signal.c - WeeChat signal hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-signal.h b/src/core/hook/hook-signal.h
index 75c22e159..183abe4a9 100644
--- a/src/core/hook/hook-signal.h
+++ b/src/core/hook/hook-signal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-timer.c b/src/core/hook/hook-timer.c
index 0c2f6a75f..3e25a1397 100644
--- a/src/core/hook/hook-timer.c
+++ b/src/core/hook/hook-timer.c
@@ -1,7 +1,7 @@
 /*
  * hook-timer.c - WeeChat timer hook
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-timer.h b/src/core/hook/hook-timer.h
index 6b6050c52..3670a883c 100644
--- a/src/core/hook/hook-timer.h
+++ b/src/core/hook/hook-timer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-url.c b/src/core/hook/hook-url.c
index 29e66a845..d39bc07fc 100644
--- a/src/core/hook/hook-url.c
+++ b/src/core/hook/hook-url.c
@@ -1,7 +1,7 @@
 /*
  * hook-url.c - WeeChat URL hook
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/hook/hook-url.h b/src/core/hook/hook-url.h
index 95de4ebc5..b075638b1 100644
--- a/src/core/hook/hook-url.h
+++ b/src/core/hook/hook-url.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/weechat.c b/src/core/weechat.c
index 187c73961..7e9a2a609 100644
--- a/src/core/weechat.c
+++ b/src/core/weechat.c
@@ -17,7 +17,7 @@
  *
  * weechat.c - WeeChat main functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/core/weechat.h b/src/core/weechat.h
index fcbc6d943..8b3f567bb 100644
--- a/src/core/weechat.h
+++ b/src/core/weechat.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
index 7e29d1e38..86ff39992 100644
--- a/src/gui/CMakeLists.txt
+++ b/src/gui/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/gui/curses/CMakeLists.txt b/src/gui/curses/CMakeLists.txt
index ea50b423c..7ab8abbdc 100644
--- a/src/gui/curses/CMakeLists.txt
+++ b/src/gui/curses/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2007-2008 Julien Louis <ptitlouis@sysif.net>
-# Copyright (C) 2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2007-2008 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/gui/curses/gui-curses-bar-window.c b/src/gui/curses/gui-curses-bar-window.c
index a63b5d224..373a332e5 100644
--- a/src/gui/curses/gui-curses-bar-window.c
+++ b/src/gui/curses/gui-curses-bar-window.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-bar-window.c - bar window functions for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-bar-window.h b/src/gui/curses/gui-curses-bar-window.h
index 4b5cd0e5e..bf81f6aa5 100644
--- a/src/gui/curses/gui-curses-bar-window.h
+++ b/src/gui/curses/gui-curses-bar-window.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-chat.c b/src/gui/curses/gui-curses-chat.c
index 5c6ae640d..eacaaaabe 100644
--- a/src/gui/curses/gui-curses-chat.c
+++ b/src/gui/curses/gui-curses-chat.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-chat.c - chat display functions for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-chat.h b/src/gui/curses/gui-curses-chat.h
index df4ab7cb3..8af8e2e51 100644
--- a/src/gui/curses/gui-curses-chat.h
+++ b/src/gui/curses/gui-curses-chat.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-color.c b/src/gui/curses/gui-curses-color.c
index 19ef7bbcf..4c36b0535 100644
--- a/src/gui/curses/gui-curses-color.c
+++ b/src/gui/curses/gui-curses-color.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-color.c - color functions for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-color.h b/src/gui/curses/gui-curses-color.h
index 634c7a69e..374af95c8 100644
--- a/src/gui/curses/gui-curses-color.h
+++ b/src/gui/curses/gui-curses-color.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-key.c b/src/gui/curses/gui-curses-key.c
index 31c62c529..feb9de4f3 100644
--- a/src/gui/curses/gui-curses-key.c
+++ b/src/gui/curses/gui-curses-key.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-key.c - keyboard functions for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-key.h b/src/gui/curses/gui-curses-key.h
index 68a2cd2e0..41cfbfc7e 100644
--- a/src/gui/curses/gui-curses-key.h
+++ b/src/gui/curses/gui-curses-key.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-main.c b/src/gui/curses/gui-curses-main.c
index 9f3e76bec..5cf6866ef 100644
--- a/src/gui/curses/gui-curses-main.c
+++ b/src/gui/curses/gui-curses-main.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-main.c - main loop for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-main.h b/src/gui/curses/gui-curses-main.h
index b50a4b68b..9d5c39804 100644
--- a/src/gui/curses/gui-curses-main.h
+++ b/src/gui/curses/gui-curses-main.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-mouse.c b/src/gui/curses/gui-curses-mouse.c
index 29af23731..59b3f6003 100644
--- a/src/gui/curses/gui-curses-mouse.c
+++ b/src/gui/curses/gui-curses-mouse.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-mouse.c - mouse functions for Curses GUI
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-mouse.h b/src/gui/curses/gui-curses-mouse.h
index 84bd9902d..04bb643d6 100644
--- a/src/gui/curses/gui-curses-mouse.h
+++ b/src/gui/curses/gui-curses-mouse.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-term.c b/src/gui/curses/gui-curses-term.c
index c90bfbe6d..c46e2e2f7 100644
--- a/src/gui/curses/gui-curses-term.c
+++ b/src/gui/curses/gui-curses-term.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-term.c - terminal functions for Curses GUI
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-window.c b/src/gui/curses/gui-curses-window.c
index fd8aa017a..0b5edf8d3 100644
--- a/src/gui/curses/gui-curses-window.c
+++ b/src/gui/curses/gui-curses-window.c
@@ -1,7 +1,7 @@
 /*
  * gui-curses-window.c - window display functions for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses-window.h b/src/gui/curses/gui-curses-window.h
index 827018f8e..178a30302 100644
--- a/src/gui/curses/gui-curses-window.h
+++ b/src/gui/curses/gui-curses-window.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/gui-curses.h b/src/gui/curses/gui-curses.h
index 2eb0040e9..79d7081f3 100644
--- a/src/gui/curses/gui-curses.h
+++ b/src/gui/curses/gui-curses.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/headless/CMakeLists.txt b/src/gui/curses/headless/CMakeLists.txt
index 6c11e4dd0..278090487 100644
--- a/src/gui/curses/headless/CMakeLists.txt
+++ b/src/gui/curses/headless/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/gui/curses/headless/main.c b/src/gui/curses/headless/main.c
index 594ad78d0..e2ec4ffb2 100644
--- a/src/gui/curses/headless/main.c
+++ b/src/gui/curses/headless/main.c
@@ -1,7 +1,7 @@
 /*
  * main.c - entry point for headless mode (no GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/headless/ncurses-fake.c b/src/gui/curses/headless/ncurses-fake.c
index c9a38e36c..3dc3c834d 100644
--- a/src/gui/curses/headless/ncurses-fake.c
+++ b/src/gui/curses/headless/ncurses-fake.c
@@ -1,7 +1,7 @@
 /*
  * ncurses-fake.c - fake ncurses lib (for headless mode and tests)
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/headless/ncurses-fake.h b/src/gui/curses/headless/ncurses-fake.h
index 6f1e9d580..a8a1fc549 100644
--- a/src/gui/curses/headless/ncurses-fake.h
+++ b/src/gui/curses/headless/ncurses-fake.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/curses/normal/CMakeLists.txt b/src/gui/curses/normal/CMakeLists.txt
index 70fc388b8..0f1734aba 100644
--- a/src/gui/curses/normal/CMakeLists.txt
+++ b/src/gui/curses/normal/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/gui/curses/normal/main.c b/src/gui/curses/normal/main.c
index 48563d474..6f792aa86 100644
--- a/src/gui/curses/normal/main.c
+++ b/src/gui/curses/normal/main.c
@@ -1,7 +1,7 @@
 /*
  * main.c - entry point for Curses GUI
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar-item-custom.c b/src/gui/gui-bar-item-custom.c
index d1fa05c65..e3f60b7ba 100644
--- a/src/gui/gui-bar-item-custom.c
+++ b/src/gui/gui-bar-item-custom.c
@@ -1,7 +1,7 @@
 /*
  * gui-bar-item-custom.c - custom bar item functions (used by all GUI)
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar-item-custom.h b/src/gui/gui-bar-item-custom.h
index 4e505ac6b..a55ee7372 100644
--- a/src/gui/gui-bar-item-custom.h
+++ b/src/gui/gui-bar-item-custom.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar-item.c b/src/gui/gui-bar-item.c
index 77f49dc06..3b71c6273 100644
--- a/src/gui/gui-bar-item.c
+++ b/src/gui/gui-bar-item.c
@@ -1,7 +1,7 @@
 /*
  * gui-bar-item.c - bar item functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar-item.h b/src/gui/gui-bar-item.h
index a1c00268d..5885ccc62 100644
--- a/src/gui/gui-bar-item.h
+++ b/src/gui/gui-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar-window.c b/src/gui/gui-bar-window.c
index 6e8f9abc0..548d2005b 100644
--- a/src/gui/gui-bar-window.c
+++ b/src/gui/gui-bar-window.c
@@ -1,7 +1,7 @@
 /*
  * gui-bar-window.c - bar window functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar-window.h b/src/gui/gui-bar-window.h
index 36f8229eb..10c231256 100644
--- a/src/gui/gui-bar-window.h
+++ b/src/gui/gui-bar-window.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar.c b/src/gui/gui-bar.c
index 2270d0e08..915e27f26 100644
--- a/src/gui/gui-bar.c
+++ b/src/gui/gui-bar.c
@@ -1,7 +1,7 @@
 /*
  * gui-bar.c - bar functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-bar.h b/src/gui/gui-bar.h
index ae5b62f87..19a6a2131 100644
--- a/src/gui/gui-bar.h
+++ b/src/gui/gui-bar.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-buffer.c b/src/gui/gui-buffer.c
index 62cb6317c..7e90e9147 100644
--- a/src/gui/gui-buffer.c
+++ b/src/gui/gui-buffer.c
@@ -1,7 +1,7 @@
 /*
  * gui-buffer.c - buffer functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-buffer.h b/src/gui/gui-buffer.h
index 94d330be8..3f01ee558 100644
--- a/src/gui/gui-buffer.h
+++ b/src/gui/gui-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-chat.c b/src/gui/gui-chat.c
index f18d53a30..758fc43ad 100644
--- a/src/gui/gui-chat.c
+++ b/src/gui/gui-chat.c
@@ -1,7 +1,7 @@
 /*
  * gui-chat.c - chat functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-chat.h b/src/gui/gui-chat.h
index 2a23e6885..b67288f43 100644
--- a/src/gui/gui-chat.h
+++ b/src/gui/gui-chat.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-color.c b/src/gui/gui-color.c
index 16d5e7901..5a0c1f746 100644
--- a/src/gui/gui-color.c
+++ b/src/gui/gui-color.c
@@ -1,7 +1,7 @@
 /*
  * gui-color.c - color functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-color.h b/src/gui/gui-color.h
index cff4a3dac..7d55e7ec2 100644
--- a/src/gui/gui-color.h
+++ b/src/gui/gui-color.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-completion.c b/src/gui/gui-completion.c
index 267c72bc9..c86633326 100644
--- a/src/gui/gui-completion.c
+++ b/src/gui/gui-completion.c
@@ -1,7 +1,7 @@
 /*
  * gui-completion.c - word completion according to context (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-completion.h b/src/gui/gui-completion.h
index ff64714e9..beb439dc3 100644
--- a/src/gui/gui-completion.h
+++ b/src/gui/gui-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-cursor.c b/src/gui/gui-cursor.c
index 9d9121a39..7ba042735 100644
--- a/src/gui/gui-cursor.c
+++ b/src/gui/gui-cursor.c
@@ -1,7 +1,7 @@
 /*
  * gui-cursor.c - functions for free movement of cursor (used by all GUI)
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-cursor.h b/src/gui/gui-cursor.h
index a85f8da03..e23545742 100644
--- a/src/gui/gui-cursor.h
+++ b/src/gui/gui-cursor.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-filter.c b/src/gui/gui-filter.c
index a40d867e9..6d21fece6 100644
--- a/src/gui/gui-filter.c
+++ b/src/gui/gui-filter.c
@@ -1,7 +1,7 @@
 /*
  * gui-filter.c - filter functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-filter.h b/src/gui/gui-filter.h
index 4e28ace9f..92fc98153 100644
--- a/src/gui/gui-filter.h
+++ b/src/gui/gui-filter.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-focus.c b/src/gui/gui-focus.c
index 135fae9a8..7ee8c5c7d 100644
--- a/src/gui/gui-focus.c
+++ b/src/gui/gui-focus.c
@@ -1,7 +1,7 @@
 /*
  * gui-focus.c - functions about focus (cursor mode and mouse) (used by all GUI)
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-focus.h b/src/gui/gui-focus.h
index caa4f4320..ebec5bf84 100644
--- a/src/gui/gui-focus.h
+++ b/src/gui/gui-focus.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-history.c b/src/gui/gui-history.c
index dd544273a..ae49cfc76 100644
--- a/src/gui/gui-history.c
+++ b/src/gui/gui-history.c
@@ -1,8 +1,8 @@
 /*
  * gui-history.c - memorize commands or text for buffers (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-history.h b/src/gui/gui-history.h
index 5ae674cd6..9b9b5c51a 100644
--- a/src/gui/gui-history.h
+++ b/src/gui/gui-history.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-hotlist.c b/src/gui/gui-hotlist.c
index 4c561daf4..d5aec1dcf 100644
--- a/src/gui/gui-hotlist.c
+++ b/src/gui/gui-hotlist.c
@@ -1,7 +1,7 @@
 /*
  * gui-hotlist.c - hotlist management (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-hotlist.h b/src/gui/gui-hotlist.h
index bc3e5a80b..37a9dc177 100644
--- a/src/gui/gui-hotlist.h
+++ b/src/gui/gui-hotlist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-input.c b/src/gui/gui-input.c
index 99d0bf5b4..63d3ed75d 100644
--- a/src/gui/gui-input.c
+++ b/src/gui/gui-input.c
@@ -1,7 +1,7 @@
 /*
  * gui-input.c - input functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-input.h b/src/gui/gui-input.h
index fc37b8907..9522deaa6 100644
--- a/src/gui/gui-input.h
+++ b/src/gui/gui-input.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-key.c b/src/gui/gui-key.c
index be82fd08b..08800aec8 100644
--- a/src/gui/gui-key.c
+++ b/src/gui/gui-key.c
@@ -1,7 +1,7 @@
 /*
  * gui-key.c - keyboard functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-key.h b/src/gui/gui-key.h
index e6e6e97f3..c9eff63a2 100644
--- a/src/gui/gui-key.h
+++ b/src/gui/gui-key.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-layout.c b/src/gui/gui-layout.c
index 5dd8f8e6a..cfd8b96b5 100644
--- a/src/gui/gui-layout.c
+++ b/src/gui/gui-layout.c
@@ -1,7 +1,7 @@
 /*
  * gui-layout.c - layout functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-layout.h b/src/gui/gui-layout.h
index b312d8a5a..ce75a1a2e 100644
--- a/src/gui/gui-layout.h
+++ b/src/gui/gui-layout.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-line.c b/src/gui/gui-line.c
index 9db1f09fb..72b613984 100644
--- a/src/gui/gui-line.c
+++ b/src/gui/gui-line.c
@@ -1,7 +1,7 @@
 /*
  * gui-line.c - line functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-line.h b/src/gui/gui-line.h
index a3d5d660d..d4a352e47 100644
--- a/src/gui/gui-line.h
+++ b/src/gui/gui-line.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-main.h b/src/gui/gui-main.h
index 61edf9811..0a1eae853 100644
--- a/src/gui/gui-main.h
+++ b/src/gui/gui-main.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-mouse.c b/src/gui/gui-mouse.c
index 3b9e169ba..5d2d22cd6 100644
--- a/src/gui/gui-mouse.c
+++ b/src/gui/gui-mouse.c
@@ -1,7 +1,7 @@
 /*
  * gui-mouse.c - functions for mouse (used by all GUI)
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-mouse.h b/src/gui/gui-mouse.h
index c9560fe48..2d138cd75 100644
--- a/src/gui/gui-mouse.h
+++ b/src/gui/gui-mouse.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-nick.c b/src/gui/gui-nick.c
index a69ca1591..32534468e 100644
--- a/src/gui/gui-nick.c
+++ b/src/gui/gui-nick.c
@@ -1,7 +1,7 @@
 /*
  * gui-nick.c - nick functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-nick.h b/src/gui/gui-nick.h
index 8f2c60ef3..24643d55f 100644
--- a/src/gui/gui-nick.h
+++ b/src/gui/gui-nick.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-nicklist.c b/src/gui/gui-nicklist.c
index bad94fc60..7a2c23763 100644
--- a/src/gui/gui-nicklist.c
+++ b/src/gui/gui-nicklist.c
@@ -1,7 +1,7 @@
 /*
  * gui-nicklist.c - nicklist functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-nicklist.h b/src/gui/gui-nicklist.h
index adbd597aa..f40ca35fc 100644
--- a/src/gui/gui-nicklist.h
+++ b/src/gui/gui-nicklist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-window.c b/src/gui/gui-window.c
index 4803c0697..86360fb51 100644
--- a/src/gui/gui-window.c
+++ b/src/gui/gui-window.c
@@ -1,7 +1,7 @@
 /*
  * gui-window.c - window functions (used by all GUI)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/gui/gui-window.h b/src/gui/gui-window.h
index c0501c18d..d34acca95 100644
--- a/src/gui/gui-window.h
+++ b/src/gui/gui-window.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/CMakeLists.txt b/src/plugins/CMakeLists.txt
index 2be1879a0..b54735610 100644
--- a/src/plugins/CMakeLists.txt
+++ b/src/plugins/CMakeLists.txt
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
-# Copyright (C) 2009 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2009 Emmanuel Bouthenot <kolter@openics.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/alias/CMakeLists.txt b/src/plugins/alias/CMakeLists.txt
index 02a67966e..a0de68107 100644
--- a/src/plugins/alias/CMakeLists.txt
+++ b/src/plugins/alias/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/alias/alias-command.c b/src/plugins/alias/alias-command.c
index 9f5653ebb..c43dd5c0e 100644
--- a/src/plugins/alias/alias-command.c
+++ b/src/plugins/alias/alias-command.c
@@ -1,7 +1,7 @@
 /*
  * alias-command.c - alias commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-command.h b/src/plugins/alias/alias-command.h
index 9e3345d55..83682de3e 100644
--- a/src/plugins/alias/alias-command.h
+++ b/src/plugins/alias/alias-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-completion.c b/src/plugins/alias/alias-completion.c
index 86f358bfa..20c4c148b 100644
--- a/src/plugins/alias/alias-completion.c
+++ b/src/plugins/alias/alias-completion.c
@@ -1,7 +1,7 @@
 /*
  * alias-completion.c - completion for alias commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-completion.h b/src/plugins/alias/alias-completion.h
index 6b3d8400d..07b4f98ec 100644
--- a/src/plugins/alias/alias-completion.h
+++ b/src/plugins/alias/alias-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-config.c b/src/plugins/alias/alias-config.c
index a8bad518d..4fd52c762 100644
--- a/src/plugins/alias/alias-config.c
+++ b/src/plugins/alias/alias-config.c
@@ -1,7 +1,7 @@
 /*
  * alias-config.c - alias configuration options (file alias.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-config.h b/src/plugins/alias/alias-config.h
index 277e3f3f7..2af434f3a 100644
--- a/src/plugins/alias/alias-config.h
+++ b/src/plugins/alias/alias-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-info.c b/src/plugins/alias/alias-info.c
index 2b63cfad0..f00ed44eb 100644
--- a/src/plugins/alias/alias-info.c
+++ b/src/plugins/alias/alias-info.c
@@ -1,7 +1,7 @@
 /*
  * alias-info.c - info and infolist hooks for alias plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias-info.h b/src/plugins/alias/alias-info.h
index 65fbaeed9..ef1e75ca6 100644
--- a/src/plugins/alias/alias-info.h
+++ b/src/plugins/alias/alias-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias.c b/src/plugins/alias/alias.c
index 611f87fd1..21b7a269e 100644
--- a/src/plugins/alias/alias.c
+++ b/src/plugins/alias/alias.c
@@ -1,7 +1,7 @@
 /*
  * alias.c - alias plugin for WeeChat: command aliases
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/alias/alias.h b/src/plugins/alias/alias.h
index 98d42fa44..9b1a96fb5 100644
--- a/src/plugins/alias/alias.h
+++ b/src/plugins/alias/alias.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/CMakeLists.txt b/src/plugins/buflist/CMakeLists.txt
index 3df672d67..b292e1131 100644
--- a/src/plugins/buflist/CMakeLists.txt
+++ b/src/plugins/buflist/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/buflist/buflist-bar-item.c b/src/plugins/buflist/buflist-bar-item.c
index d10c97085..c0caa18ee 100644
--- a/src/plugins/buflist/buflist-bar-item.c
+++ b/src/plugins/buflist/buflist-bar-item.c
@@ -1,7 +1,7 @@
 /*
  * buflist-bar-item.c - bar item for buflist plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-bar-item.h b/src/plugins/buflist/buflist-bar-item.h
index 22a40cfb1..77c51bbe6 100644
--- a/src/plugins/buflist/buflist-bar-item.h
+++ b/src/plugins/buflist/buflist-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-command.c b/src/plugins/buflist/buflist-command.c
index cf47d1759..708d36d74 100644
--- a/src/plugins/buflist/buflist-command.c
+++ b/src/plugins/buflist/buflist-command.c
@@ -1,7 +1,7 @@
 /*
  * buflist-command.c - buflist command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-command.h b/src/plugins/buflist/buflist-command.h
index 37d3e6581..484d3ee23 100644
--- a/src/plugins/buflist/buflist-command.h
+++ b/src/plugins/buflist/buflist-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-completion.c b/src/plugins/buflist/buflist-completion.c
index d8ee778a6..0ff25e3b2 100644
--- a/src/plugins/buflist/buflist-completion.c
+++ b/src/plugins/buflist/buflist-completion.c
@@ -1,7 +1,7 @@
 /*
  * buflist-completion.c - completion for buflist command
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-completion.h b/src/plugins/buflist/buflist-completion.h
index 22df3563f..963850f2c 100644
--- a/src/plugins/buflist/buflist-completion.h
+++ b/src/plugins/buflist/buflist-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-config.c b/src/plugins/buflist/buflist-config.c
index a3a1bccbe..5cdf1fe37 100644
--- a/src/plugins/buflist/buflist-config.c
+++ b/src/plugins/buflist/buflist-config.c
@@ -1,7 +1,7 @@
 /*
  * buflist-config.c - buflist configuration options (file buflist.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-config.h b/src/plugins/buflist/buflist-config.h
index abcd9801e..17a6828a2 100644
--- a/src/plugins/buflist/buflist-config.h
+++ b/src/plugins/buflist/buflist-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-info.c b/src/plugins/buflist/buflist-info.c
index aca4ae01b..bc2336041 100644
--- a/src/plugins/buflist/buflist-info.c
+++ b/src/plugins/buflist/buflist-info.c
@@ -1,8 +1,8 @@
 /*
  * buflist-info.c - infolist hook for buflist plugin
  *
- * Copyright (C) 2019 Simmo Saan <simmo.saan@gmail.com>
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019 Simmo Saan <simmo.saan@gmail.com>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-info.h b/src/plugins/buflist/buflist-info.h
index fddf2ac65..deb69e2b3 100644
--- a/src/plugins/buflist/buflist-info.h
+++ b/src/plugins/buflist/buflist-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019 Simmo Saan <simmo.saan@gmail.com>
+ * SPDX-FileCopyrightText: 2019 Simmo Saan <simmo.saan@gmail.com>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-mouse.c b/src/plugins/buflist/buflist-mouse.c
index aa917c3f3..3f939095e 100644
--- a/src/plugins/buflist/buflist-mouse.c
+++ b/src/plugins/buflist/buflist-mouse.c
@@ -1,7 +1,7 @@
 /*
  * buflist-mouse.c - mouse actions for buflist
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist-mouse.h b/src/plugins/buflist/buflist-mouse.h
index b25d5118f..a95ca6bd2 100644
--- a/src/plugins/buflist/buflist-mouse.h
+++ b/src/plugins/buflist/buflist-mouse.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist.c b/src/plugins/buflist/buflist.c
index 199af90cc..6d62e7c03 100644
--- a/src/plugins/buflist/buflist.c
+++ b/src/plugins/buflist/buflist.c
@@ -1,7 +1,7 @@
 /*
  * buflist.c - Bar with list of buffers
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/buflist/buflist.h b/src/plugins/buflist/buflist.h
index 2f9cc2f3b..a5b02be28 100644
--- a/src/plugins/buflist/buflist.h
+++ b/src/plugins/buflist/buflist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/charset/CMakeLists.txt b/src/plugins/charset/CMakeLists.txt
index 82f847aaa..201a5b36c 100644
--- a/src/plugins/charset/CMakeLists.txt
+++ b/src/plugins/charset/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/charset/charset.c b/src/plugins/charset/charset.c
index 90827c86a..4f5b8b424 100644
--- a/src/plugins/charset/charset.c
+++ b/src/plugins/charset/charset.c
@@ -1,7 +1,7 @@
 /*
  * charset.c - charset plugin for WeeChat: encode/decode strings
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/charset/charset.h b/src/plugins/charset/charset.h
index 756d013f0..45197b56e 100644
--- a/src/plugins/charset/charset.h
+++ b/src/plugins/charset/charset.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/CMakeLists.txt b/src/plugins/exec/CMakeLists.txt
index 4a04c35a0..186031ad8 100644
--- a/src/plugins/exec/CMakeLists.txt
+++ b/src/plugins/exec/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/exec/exec-buffer.c b/src/plugins/exec/exec-buffer.c
index 1226f020f..133a9ecd1 100644
--- a/src/plugins/exec/exec-buffer.c
+++ b/src/plugins/exec/exec-buffer.c
@@ -1,7 +1,7 @@
 /*
  * exec-buffer.c - buffers with output of commands
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-buffer.h b/src/plugins/exec/exec-buffer.h
index 1d916a921..9c25408fa 100644
--- a/src/plugins/exec/exec-buffer.h
+++ b/src/plugins/exec/exec-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-command.c b/src/plugins/exec/exec-command.c
index 58c1b6bf0..3989f0cf4 100644
--- a/src/plugins/exec/exec-command.c
+++ b/src/plugins/exec/exec-command.c
@@ -1,7 +1,7 @@
 /*
  * exec-command.c - exec command
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-command.h b/src/plugins/exec/exec-command.h
index 1ee947eea..54d8d0175 100644
--- a/src/plugins/exec/exec-command.h
+++ b/src/plugins/exec/exec-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-completion.c b/src/plugins/exec/exec-completion.c
index 1090128e5..32f7cc3ad 100644
--- a/src/plugins/exec/exec-completion.c
+++ b/src/plugins/exec/exec-completion.c
@@ -1,7 +1,7 @@
 /*
  * exec-completion.c - completion for exec commands
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-completion.h b/src/plugins/exec/exec-completion.h
index ca2bb3852..a37f6881e 100644
--- a/src/plugins/exec/exec-completion.h
+++ b/src/plugins/exec/exec-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-config.c b/src/plugins/exec/exec-config.c
index 61b5e1366..357dc845d 100644
--- a/src/plugins/exec/exec-config.c
+++ b/src/plugins/exec/exec-config.c
@@ -1,7 +1,7 @@
 /*
  * exec-config.c - exec configuration options (file exec.conf)
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec-config.h b/src/plugins/exec/exec-config.h
index 3deffb83a..4adbd210d 100644
--- a/src/plugins/exec/exec-config.h
+++ b/src/plugins/exec/exec-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec.c b/src/plugins/exec/exec.c
index 96d0c9319..0bf5e44d7 100644
--- a/src/plugins/exec/exec.c
+++ b/src/plugins/exec/exec.c
@@ -1,7 +1,7 @@
 /*
  * exec.c - execution of external commands in WeeChat
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/exec/exec.h b/src/plugins/exec/exec.h
index d30e8c0bd..794912d3b 100644
--- a/src/plugins/exec/exec.h
+++ b/src/plugins/exec/exec.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/CMakeLists.txt b/src/plugins/fifo/CMakeLists.txt
index 1fb584b6c..c17775ee3 100644
--- a/src/plugins/fifo/CMakeLists.txt
+++ b/src/plugins/fifo/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/fifo/fifo-command.c b/src/plugins/fifo/fifo-command.c
index 0826cdf4d..bbfceae6e 100644
--- a/src/plugins/fifo/fifo-command.c
+++ b/src/plugins/fifo/fifo-command.c
@@ -1,7 +1,7 @@
 /*
  * fifo-command.c - fifo command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo-command.h b/src/plugins/fifo/fifo-command.h
index d30725bfd..1127b9cfb 100644
--- a/src/plugins/fifo/fifo-command.h
+++ b/src/plugins/fifo/fifo-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo-config.c b/src/plugins/fifo/fifo-config.c
index 4b9c9be43..5899e5110 100644
--- a/src/plugins/fifo/fifo-config.c
+++ b/src/plugins/fifo/fifo-config.c
@@ -1,7 +1,7 @@
 /*
  * fifo-config.c - fifo configuration options (file fifo.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo-config.h b/src/plugins/fifo/fifo-config.h
index fd33fc561..a4726f4e3 100644
--- a/src/plugins/fifo/fifo-config.h
+++ b/src/plugins/fifo/fifo-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo-info.c b/src/plugins/fifo/fifo-info.c
index 3f28fe67e..d4230432e 100644
--- a/src/plugins/fifo/fifo-info.c
+++ b/src/plugins/fifo/fifo-info.c
@@ -1,7 +1,7 @@
 /*
  * fifo-info.c - info and infolist hooks for fifo plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo-info.h b/src/plugins/fifo/fifo-info.h
index 04eb1abc7..c01f35332 100644
--- a/src/plugins/fifo/fifo-info.h
+++ b/src/plugins/fifo/fifo-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo.c b/src/plugins/fifo/fifo.c
index 1df442748..85edc247b 100644
--- a/src/plugins/fifo/fifo.c
+++ b/src/plugins/fifo/fifo.c
@@ -1,7 +1,7 @@
 /*
  * fifo.c - fifo plugin for WeeChat: remote control with FIFO pipe
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fifo/fifo.h b/src/plugins/fifo/fifo.h
index 17237c9bf..13af678d7 100644
--- a/src/plugins/fifo/fifo.h
+++ b/src/plugins/fifo/fifo.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/CMakeLists.txt b/src/plugins/fset/CMakeLists.txt
index c684e959f..bdb4480a0 100644
--- a/src/plugins/fset/CMakeLists.txt
+++ b/src/plugins/fset/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/fset/fset-bar-item.c b/src/plugins/fset/fset-bar-item.c
index 207ca167a..bc4a87487 100644
--- a/src/plugins/fset/fset-bar-item.c
+++ b/src/plugins/fset/fset-bar-item.c
@@ -1,7 +1,7 @@
 /*
  * fset-bar-item.c - bar item for Fast Set plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-bar-item.h b/src/plugins/fset/fset-bar-item.h
index 889f4ac21..4feb2f885 100644
--- a/src/plugins/fset/fset-bar-item.h
+++ b/src/plugins/fset/fset-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-buffer.c b/src/plugins/fset/fset-buffer.c
index 314ddd68e..2fc95f4e1 100644
--- a/src/plugins/fset/fset-buffer.c
+++ b/src/plugins/fset/fset-buffer.c
@@ -1,7 +1,7 @@
 /*
  * fset-buffer.c - buffer for Fast Set plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-buffer.h b/src/plugins/fset/fset-buffer.h
index 464b850b5..c83320d13 100644
--- a/src/plugins/fset/fset-buffer.h
+++ b/src/plugins/fset/fset-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-command.c b/src/plugins/fset/fset-command.c
index 74e179efd..bec215b1b 100644
--- a/src/plugins/fset/fset-command.c
+++ b/src/plugins/fset/fset-command.c
@@ -1,7 +1,7 @@
 /*
  * fset-command.c - Fast Set command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-command.h b/src/plugins/fset/fset-command.h
index 48cbd1e14..0d45e1b0a 100644
--- a/src/plugins/fset/fset-command.h
+++ b/src/plugins/fset/fset-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-completion.c b/src/plugins/fset/fset-completion.c
index b34692d75..b3958fb8d 100644
--- a/src/plugins/fset/fset-completion.c
+++ b/src/plugins/fset/fset-completion.c
@@ -1,7 +1,7 @@
 /*
  * fset-completion.c - completion for Fast Set commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-completion.h b/src/plugins/fset/fset-completion.h
index c9e9be1f2..2fe7f1b2a 100644
--- a/src/plugins/fset/fset-completion.h
+++ b/src/plugins/fset/fset-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-config.c b/src/plugins/fset/fset-config.c
index 3c3205f90..929e0a7ee 100644
--- a/src/plugins/fset/fset-config.c
+++ b/src/plugins/fset/fset-config.c
@@ -1,7 +1,7 @@
 /*
  * fset-config.c - Fast Set configuration options (file fset.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-config.h b/src/plugins/fset/fset-config.h
index 5a283521b..24cafaab7 100644
--- a/src/plugins/fset/fset-config.h
+++ b/src/plugins/fset/fset-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-info.c b/src/plugins/fset/fset-info.c
index 75ce14b0d..d4394a072 100644
--- a/src/plugins/fset/fset-info.c
+++ b/src/plugins/fset/fset-info.c
@@ -1,7 +1,7 @@
 /*
  * fset-info.c - info, infolist and hdata hooks for Fast Set plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-info.h b/src/plugins/fset/fset-info.h
index 51d07c680..0d25b4334 100644
--- a/src/plugins/fset/fset-info.h
+++ b/src/plugins/fset/fset-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-mouse.c b/src/plugins/fset/fset-mouse.c
index 8afd7625f..07ca95547 100644
--- a/src/plugins/fset/fset-mouse.c
+++ b/src/plugins/fset/fset-mouse.c
@@ -1,7 +1,7 @@
 /*
  * fset-mouse.c - mouse actions for Fast Set plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-mouse.h b/src/plugins/fset/fset-mouse.h
index 84ea23cda..09e9eb94e 100644
--- a/src/plugins/fset/fset-mouse.h
+++ b/src/plugins/fset/fset-mouse.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-option.c b/src/plugins/fset/fset-option.c
index d53988a36..1a507e166 100644
--- a/src/plugins/fset/fset-option.c
+++ b/src/plugins/fset/fset-option.c
@@ -1,7 +1,7 @@
 /*
  * fset-option.c - manage options displayed by Fast Set buffer
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset-option.h b/src/plugins/fset/fset-option.h
index 10cf62b7e..3f833313c 100644
--- a/src/plugins/fset/fset-option.h
+++ b/src/plugins/fset/fset-option.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset.c b/src/plugins/fset/fset.c
index 7c5067cba..84bcaac59 100644
--- a/src/plugins/fset/fset.c
+++ b/src/plugins/fset/fset.c
@@ -1,7 +1,7 @@
 /*
  * fset.c - Fast set of WeeChat and plugins options
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/fset/fset.h b/src/plugins/fset/fset.h
index 08fd6adc9..ede423d4c 100644
--- a/src/plugins/fset/fset.h
+++ b/src/plugins/fset/fset.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/guile/CMakeLists.txt b/src/plugins/guile/CMakeLists.txt
index e3c9e09d3..aa9b2ae55 100644
--- a/src/plugins/guile/CMakeLists.txt
+++ b/src/plugins/guile/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/guile/weechat-guile-api.c b/src/plugins/guile/weechat-guile-api.c
index f47ca9175..085ffefda 100644
--- a/src/plugins/guile/weechat-guile-api.c
+++ b/src/plugins/guile/weechat-guile-api.c
@@ -1,8 +1,8 @@
 /*
  * weechat-guile-api.c - guile API functions
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/guile/weechat-guile-api.h b/src/plugins/guile/weechat-guile-api.h
index ee387b3e1..ee149dff6 100644
--- a/src/plugins/guile/weechat-guile-api.h
+++ b/src/plugins/guile/weechat-guile-api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/guile/weechat-guile.c b/src/plugins/guile/weechat-guile.c
index 64e024742..789e67e41 100644
--- a/src/plugins/guile/weechat-guile.c
+++ b/src/plugins/guile/weechat-guile.c
@@ -1,7 +1,7 @@
 /*
  * weechat-guile.c - guile (scheme) plugin for WeeChat
  *
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/guile/weechat-guile.h b/src/plugins/guile/weechat-guile.h
index bf6580a38..6703568f6 100644
--- a/src/plugins/guile/weechat-guile.h
+++ b/src/plugins/guile/weechat-guile.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2011-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/CMakeLists.txt b/src/plugins/irc/CMakeLists.txt
index a0eaa96d9..8ad019d0b 100644
--- a/src/plugins/irc/CMakeLists.txt
+++ b/src/plugins/irc/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/irc/irc-bar-item.c b/src/plugins/irc/irc-bar-item.c
index ea3633d4a..269d0edc7 100644
--- a/src/plugins/irc/irc-bar-item.c
+++ b/src/plugins/irc/irc-bar-item.c
@@ -1,7 +1,7 @@
 /*
  * irc-bar-item.c - bar items for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-bar-item.h b/src/plugins/irc/irc-bar-item.h
index 9cc48fae3..e3ff216be 100644
--- a/src/plugins/irc/irc-bar-item.h
+++ b/src/plugins/irc/irc-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-batch.c b/src/plugins/irc/irc-batch.c
index f84e6f5bb..342470f41 100644
--- a/src/plugins/irc/irc-batch.c
+++ b/src/plugins/irc/irc-batch.c
@@ -1,7 +1,7 @@
 /*
  * irc-batch.c - functions for managing batched events
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-batch.h b/src/plugins/irc/irc-batch.h
index cd32425bd..d4713bd1f 100644
--- a/src/plugins/irc/irc-batch.h
+++ b/src/plugins/irc/irc-batch.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-buffer.c b/src/plugins/irc/irc-buffer.c
index 12373e18d..abe3332f7 100644
--- a/src/plugins/irc/irc-buffer.c
+++ b/src/plugins/irc/irc-buffer.c
@@ -1,7 +1,7 @@
 /*
  * irc-buffer.c - buffer functions for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-buffer.h b/src/plugins/irc/irc-buffer.h
index 8c90cde61..443f2fb77 100644
--- a/src/plugins/irc/irc-buffer.h
+++ b/src/plugins/irc/irc-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-channel.c b/src/plugins/irc/irc-channel.c
index 783a2f282..14d3f89d9 100644
--- a/src/plugins/irc/irc-channel.c
+++ b/src/plugins/irc/irc-channel.c
@@ -1,7 +1,7 @@
 /*
  * irc-channel.c - channel and private chat management for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-channel.h b/src/plugins/irc/irc-channel.h
index c0bd7823a..28d941aad 100644
--- a/src/plugins/irc/irc-channel.h
+++ b/src/plugins/irc/irc-channel.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-color.c b/src/plugins/irc/irc-color.c
index 6ab50064f..0e01218b4 100644
--- a/src/plugins/irc/irc-color.c
+++ b/src/plugins/irc/irc-color.c
@@ -1,7 +1,7 @@
 /*
  * irc-color.c - IRC color decoding/encoding in messages
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-color.h b/src/plugins/irc/irc-color.h
index 5e1c7b468..802765360 100644
--- a/src/plugins/irc/irc-color.h
+++ b/src/plugins/irc/irc-color.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-command.c b/src/plugins/irc/irc-command.c
index 13ac13490..f46e40dce 100644
--- a/src/plugins/irc/irc-command.c
+++ b/src/plugins/irc/irc-command.c
@@ -1,8 +1,8 @@
 /*
  * irc-command.c - IRC commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-command.h b/src/plugins/irc/irc-command.h
index c3319ca25..7553b0648 100644
--- a/src/plugins/irc/irc-command.h
+++ b/src/plugins/irc/irc-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-completion.c b/src/plugins/irc/irc-completion.c
index 25ec7c820..00ae4c5ce 100644
--- a/src/plugins/irc/irc-completion.c
+++ b/src/plugins/irc/irc-completion.c
@@ -1,7 +1,7 @@
 /*
  * irc-completion.c - completion for IRC commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-completion.h b/src/plugins/irc/irc-completion.h
index 6dbdd238c..2e68ecbea 100644
--- a/src/plugins/irc/irc-completion.h
+++ b/src/plugins/irc/irc-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-config.c b/src/plugins/irc/irc-config.c
index 4a5492336..35780d450 100644
--- a/src/plugins/irc/irc-config.c
+++ b/src/plugins/irc/irc-config.c
@@ -1,7 +1,7 @@
 /*
  * irc-config.c - IRC configuration options (file irc.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-config.h b/src/plugins/irc/irc-config.h
index 78555f039..d9c3d986b 100644
--- a/src/plugins/irc/irc-config.h
+++ b/src/plugins/irc/irc-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-ctcp.c b/src/plugins/irc/irc-ctcp.c
index 7f363304f..385ece9cd 100644
--- a/src/plugins/irc/irc-ctcp.c
+++ b/src/plugins/irc/irc-ctcp.c
@@ -1,7 +1,7 @@
 /*
  * irc-ctcp.c - IRC CTCP protocol
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-ctcp.h b/src/plugins/irc/irc-ctcp.h
index 0259f43f3..03c9ec78f 100644
--- a/src/plugins/irc/irc-ctcp.h
+++ b/src/plugins/irc/irc-ctcp.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-debug.c b/src/plugins/irc/irc-debug.c
index 1f17e6ac8..0d5cbcd72 100644
--- a/src/plugins/irc/irc-debug.c
+++ b/src/plugins/irc/irc-debug.c
@@ -1,7 +1,7 @@
 /*
  * irc-debug.c - debug functions for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-debug.h b/src/plugins/irc/irc-debug.h
index 037df3885..bcdae7a49 100644
--- a/src/plugins/irc/irc-debug.h
+++ b/src/plugins/irc/irc-debug.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-ignore.c b/src/plugins/irc/irc-ignore.c
index 77a805305..e8e0ef6b3 100644
--- a/src/plugins/irc/irc-ignore.c
+++ b/src/plugins/irc/irc-ignore.c
@@ -1,7 +1,7 @@
 /*
  * irc-ignore.c - ignore (nicks/hosts) management for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-ignore.h b/src/plugins/irc/irc-ignore.h
index 763a8fe7a..c5ea45c34 100644
--- a/src/plugins/irc/irc-ignore.h
+++ b/src/plugins/irc/irc-ignore.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-info.c b/src/plugins/irc/irc-info.c
index d778278c0..86c3770f5 100644
--- a/src/plugins/irc/irc-info.c
+++ b/src/plugins/irc/irc-info.c
@@ -1,7 +1,7 @@
 /*
  * irc-info.c - info, infolist and hdata hooks for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-info.h b/src/plugins/irc/irc-info.h
index 0d3c7f62e..0f09febab 100644
--- a/src/plugins/irc/irc-info.h
+++ b/src/plugins/irc/irc-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-input.c b/src/plugins/irc/irc-input.c
index 2845ef461..91ce9af9d 100644
--- a/src/plugins/irc/irc-input.c
+++ b/src/plugins/irc/irc-input.c
@@ -1,7 +1,7 @@
 /*
  * irc-input.c - input data management for IRC buffers
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-input.h b/src/plugins/irc/irc-input.h
index 71e421c74..0e2c14766 100644
--- a/src/plugins/irc/irc-input.h
+++ b/src/plugins/irc/irc-input.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-join.c b/src/plugins/irc/irc-join.c
index ce6916d8f..6d5552426 100644
--- a/src/plugins/irc/irc-join.c
+++ b/src/plugins/irc/irc-join.c
@@ -1,7 +1,7 @@
 /*
  * irc-join.c - functions for list of channels to join
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-join.h b/src/plugins/irc/irc-join.h
index 2b91dc6fc..4f905b622 100644
--- a/src/plugins/irc/irc-join.h
+++ b/src/plugins/irc/irc-join.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-list.c b/src/plugins/irc/irc-list.c
index 0d1601367..5f291337e 100644
--- a/src/plugins/irc/irc-list.c
+++ b/src/plugins/irc/irc-list.c
@@ -1,7 +1,7 @@
 /*
  * irc-list.c - functions for IRC list buffer
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-list.h b/src/plugins/irc/irc-list.h
index 6f8c0b4e0..f0bc4e169 100644
--- a/src/plugins/irc/irc-list.h
+++ b/src/plugins/irc/irc-list.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-message.c b/src/plugins/irc/irc-message.c
index 576b18c9e..48ed165d3 100644
--- a/src/plugins/irc/irc-message.c
+++ b/src/plugins/irc/irc-message.c
@@ -1,7 +1,7 @@
 /*
  * irc-message.c - functions for IRC messages
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-message.h b/src/plugins/irc/irc-message.h
index 383685d75..706d25660 100644
--- a/src/plugins/irc/irc-message.h
+++ b/src/plugins/irc/irc-message.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-mode.c b/src/plugins/irc/irc-mode.c
index e7193cc72..0376cb47d 100644
--- a/src/plugins/irc/irc-mode.c
+++ b/src/plugins/irc/irc-mode.c
@@ -1,7 +1,7 @@
 /*
  * irc-mode.c - IRC channel/user modes management
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-mode.h b/src/plugins/irc/irc-mode.h
index 38b6b903b..3a5090dc4 100644
--- a/src/plugins/irc/irc-mode.h
+++ b/src/plugins/irc/irc-mode.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-modelist.c b/src/plugins/irc/irc-modelist.c
index 0938789c3..aefa6c62d 100644
--- a/src/plugins/irc/irc-modelist.c
+++ b/src/plugins/irc/irc-modelist.c
@@ -1,8 +1,8 @@
 /*
  * irc-modelist.c - channel mode list management for IRC plugin
  *
- * Copyright (C) 2015 Simmo Saan <simmo.saan@gmail.com>
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2015 Simmo Saan <simmo.saan@gmail.com>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-modelist.h b/src/plugins/irc/irc-modelist.h
index 458530661..569266003 100644
--- a/src/plugins/irc/irc-modelist.h
+++ b/src/plugins/irc/irc-modelist.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2015 Simmo Saan <simmo.saan@gmail.com>
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2015 Simmo Saan <simmo.saan@gmail.com>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-msgbuffer.c b/src/plugins/irc/irc-msgbuffer.c
index b61435b4f..c4c2141eb 100644
--- a/src/plugins/irc/irc-msgbuffer.c
+++ b/src/plugins/irc/irc-msgbuffer.c
@@ -1,7 +1,7 @@
 /*
  * irc-msgbuffer.c - target buffer for IRC messages
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-msgbuffer.h b/src/plugins/irc/irc-msgbuffer.h
index fbee08ba2..ad0488134 100644
--- a/src/plugins/irc/irc-msgbuffer.h
+++ b/src/plugins/irc/irc-msgbuffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-nick.c b/src/plugins/irc/irc-nick.c
index 50bc2788e..47711b143 100644
--- a/src/plugins/irc/irc-nick.c
+++ b/src/plugins/irc/irc-nick.c
@@ -1,7 +1,7 @@
 /*
  * irc-nick.c - nick management for IRC plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-nick.h b/src/plugins/irc/irc-nick.h
index f45d68edf..466fcf55f 100644
--- a/src/plugins/irc/irc-nick.h
+++ b/src/plugins/irc/irc-nick.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-notify.c b/src/plugins/irc/irc-notify.c
index 9c70b8683..7b22cbe85 100644
--- a/src/plugins/irc/irc-notify.c
+++ b/src/plugins/irc/irc-notify.c
@@ -1,7 +1,7 @@
 /*
  * irc-notify.c - notify lists for IRC plugin
  *
- * Copyright (C) 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-notify.h b/src/plugins/irc/irc-notify.h
index 620b34d6a..326584463 100644
--- a/src/plugins/irc/irc-notify.h
+++ b/src/plugins/irc/irc-notify.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-protocol.c b/src/plugins/irc/irc-protocol.c
index 6aacbecf2..c7a4457cd 100644
--- a/src/plugins/irc/irc-protocol.c
+++ b/src/plugins/irc/irc-protocol.c
@@ -1,9 +1,9 @@
 /*
  * irc-protocol.c - implementation of IRC protocol
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2014 Shawn Smith <ShawnSmith0828@gmail.com>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2014 Shawn Smith <ShawnSmith0828@gmail.com>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-protocol.h b/src/plugins/irc/irc-protocol.h
index 869f7c3c1..63fdb5921 100644
--- a/src/plugins/irc/irc-protocol.h
+++ b/src/plugins/irc/irc-protocol.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-raw.c b/src/plugins/irc/irc-raw.c
index 439121845..48281d310 100644
--- a/src/plugins/irc/irc-raw.c
+++ b/src/plugins/irc/irc-raw.c
@@ -1,7 +1,7 @@
 /*
  * irc-raw.c - functions for IRC raw data messages
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-raw.h b/src/plugins/irc/irc-raw.h
index 8758fdb89..90f760c37 100644
--- a/src/plugins/irc/irc-raw.h
+++ b/src/plugins/irc/irc-raw.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-redirect.c b/src/plugins/irc/irc-redirect.c
index c25125b06..fc6f6580a 100644
--- a/src/plugins/irc/irc-redirect.c
+++ b/src/plugins/irc/irc-redirect.c
@@ -1,7 +1,7 @@
 /*
  * irc-redirect.c - redirection of IRC command output
  *
- * Copyright (C) 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-redirect.h b/src/plugins/irc/irc-redirect.h
index b6b3fad5c..c73edaabb 100644
--- a/src/plugins/irc/irc-redirect.h
+++ b/src/plugins/irc/irc-redirect.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2010-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-sasl.c b/src/plugins/irc/irc-sasl.c
index cd95d3cdd..1d6e6dbf1 100644
--- a/src/plugins/irc/irc-sasl.c
+++ b/src/plugins/irc/irc-sasl.c
@@ -1,7 +1,7 @@
 /*
  * irc-sasl.c - SASL authentication with IRC server
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-sasl.h b/src/plugins/irc/irc-sasl.h
index 84df9a813..b03b1c7b1 100644
--- a/src/plugins/irc/irc-sasl.h
+++ b/src/plugins/irc/irc-sasl.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-server.c b/src/plugins/irc/irc-server.c
index 8db9917cf..2dd6b0d9c 100644
--- a/src/plugins/irc/irc-server.c
+++ b/src/plugins/irc/irc-server.c
@@ -1,9 +1,9 @@
 /*
  * irc-server.c - I/O communication with IRC servers
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2010 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2010 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-server.h b/src/plugins/irc/irc-server.h
index a3e755f3e..ce4396c1d 100644
--- a/src/plugins/irc/irc-server.h
+++ b/src/plugins/irc/irc-server.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-tag.c b/src/plugins/irc/irc-tag.c
index c906884f4..88cae31fa 100644
--- a/src/plugins/irc/irc-tag.c
+++ b/src/plugins/irc/irc-tag.c
@@ -1,7 +1,7 @@
 /*
  * irc-tag.c - functions for IRC message tags
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-tag.h b/src/plugins/irc/irc-tag.h
index 00ebb9503..ffcb15a5e 100644
--- a/src/plugins/irc/irc-tag.h
+++ b/src/plugins/irc/irc-tag.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-typing.c b/src/plugins/irc/irc-typing.c
index 11376b397..44129b75e 100644
--- a/src/plugins/irc/irc-typing.c
+++ b/src/plugins/irc/irc-typing.c
@@ -1,7 +1,7 @@
 /*
  * irc-typing.c - manage typing status on channels/private
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-typing.h b/src/plugins/irc/irc-typing.h
index e99dd9761..464e704cf 100644
--- a/src/plugins/irc/irc-typing.h
+++ b/src/plugins/irc/irc-typing.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-upgrade.c b/src/plugins/irc/irc-upgrade.c
index 12b83b6ca..417741fea 100644
--- a/src/plugins/irc/irc-upgrade.c
+++ b/src/plugins/irc/irc-upgrade.c
@@ -1,7 +1,7 @@
 /*
  * irc-upgrade.c - save/restore IRC plugin data when upgrading WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc-upgrade.h b/src/plugins/irc/irc-upgrade.h
index 3aba9cd01..984fcafd4 100644
--- a/src/plugins/irc/irc-upgrade.h
+++ b/src/plugins/irc/irc-upgrade.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc.c b/src/plugins/irc/irc.c
index 0c44f2d03..29ce5db49 100644
--- a/src/plugins/irc/irc.c
+++ b/src/plugins/irc/irc.c
@@ -1,7 +1,7 @@
 /*
  * irc.c - IRC (Internet Relay Chat) plugin for WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/irc/irc.h b/src/plugins/irc/irc.h
index c4c31a536..6f06c68f6 100644
--- a/src/plugins/irc/irc.h
+++ b/src/plugins/irc/irc.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/javascript/CMakeLists.txt b/src/plugins/javascript/CMakeLists.txt
index 4652f8c3f..88dbde85c 100644
--- a/src/plugins/javascript/CMakeLists.txt
+++ b/src/plugins/javascript/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/javascript/weechat-js-api.cpp b/src/plugins/javascript/weechat-js-api.cpp
index 2491b3165..1b69bc38d 100644
--- a/src/plugins/javascript/weechat-js-api.cpp
+++ b/src/plugins/javascript/weechat-js-api.cpp
@@ -1,8 +1,8 @@
 /*
  * weechat-js-api.cpp - javascript API functions
  *
- * Copyright (C) 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
- * Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
+ * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/javascript/weechat-js-api.h b/src/plugins/javascript/weechat-js-api.h
index b85b35060..f71d540bc 100644
--- a/src/plugins/javascript/weechat-js-api.h
+++ b/src/plugins/javascript/weechat-js-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
- * Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
+ * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/javascript/weechat-js-v8.cpp b/src/plugins/javascript/weechat-js-v8.cpp
index 1fc6846c3..1a77017e2 100644
--- a/src/plugins/javascript/weechat-js-v8.cpp
+++ b/src/plugins/javascript/weechat-js-v8.cpp
@@ -1,8 +1,8 @@
 /*
  * weechat-js-v8.cpp - v8 javascript functions
  *
- * Copyright (C) 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
- * Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
+ * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/javascript/weechat-js-v8.h b/src/plugins/javascript/weechat-js-v8.h
index 1a840193f..ff1de3ea4 100644
--- a/src/plugins/javascript/weechat-js-v8.h
+++ b/src/plugins/javascript/weechat-js-v8.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
- * Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
+ * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/javascript/weechat-js.cpp b/src/plugins/javascript/weechat-js.cpp
index 309360a51..0eceae016 100644
--- a/src/plugins/javascript/weechat-js.cpp
+++ b/src/plugins/javascript/weechat-js.cpp
@@ -1,8 +1,8 @@
 /*
  * weechat-js.cpp - javascript plugin for WeeChat
  *
- * Copyright (C) 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
- * Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
+ * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/javascript/weechat-js.h b/src/plugins/javascript/weechat-js.h
index d5e82cd34..bda417523 100644
--- a/src/plugins/javascript/weechat-js.h
+++ b/src/plugins/javascript/weechat-js.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
- * Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013 Koka El Kiwi <kokakiwi@kokakiwi.net>
+ * SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/CMakeLists.txt b/src/plugins/logger/CMakeLists.txt
index fb967c6d9..8d734da2e 100644
--- a/src/plugins/logger/CMakeLists.txt
+++ b/src/plugins/logger/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/logger/logger-backlog.c b/src/plugins/logger/logger-backlog.c
index 633570c8d..57bf94979 100644
--- a/src/plugins/logger/logger-backlog.c
+++ b/src/plugins/logger/logger-backlog.c
@@ -1,7 +1,7 @@
 /*
  * logger-backlog.c - display backlog of messages
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-backlog.h b/src/plugins/logger/logger-backlog.h
index 384439c9b..6faf49ae9 100644
--- a/src/plugins/logger/logger-backlog.h
+++ b/src/plugins/logger/logger-backlog.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-buffer.c b/src/plugins/logger/logger-buffer.c
index df0ffbcc2..42f19d624 100644
--- a/src/plugins/logger/logger-buffer.c
+++ b/src/plugins/logger/logger-buffer.c
@@ -1,7 +1,7 @@
 /*
  * logger-buffer.c - logger buffer list management
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-buffer.h b/src/plugins/logger/logger-buffer.h
index ec4da52af..75e1375cd 100644
--- a/src/plugins/logger/logger-buffer.h
+++ b/src/plugins/logger/logger-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-command.c b/src/plugins/logger/logger-command.c
index 1d3f6f9db..47fe4990b 100644
--- a/src/plugins/logger/logger-command.c
+++ b/src/plugins/logger/logger-command.c
@@ -1,7 +1,7 @@
 /*
  * logger-command.c - logger commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-command.h b/src/plugins/logger/logger-command.h
index ea1f3189a..3a4f5dd52 100644
--- a/src/plugins/logger/logger-command.h
+++ b/src/plugins/logger/logger-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-config.c b/src/plugins/logger/logger-config.c
index 16a2bbfc3..b3d68556b 100644
--- a/src/plugins/logger/logger-config.c
+++ b/src/plugins/logger/logger-config.c
@@ -1,7 +1,7 @@
 /*
  * logger-config.c - logger configuration options (file logger.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-config.h b/src/plugins/logger/logger-config.h
index 3ce53fbe5..d56a0f012 100644
--- a/src/plugins/logger/logger-config.h
+++ b/src/plugins/logger/logger-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-info.c b/src/plugins/logger/logger-info.c
index 7dbbf8b7f..17f826e45 100644
--- a/src/plugins/logger/logger-info.c
+++ b/src/plugins/logger/logger-info.c
@@ -1,7 +1,7 @@
 /*
  * logger-info.c - info and infolist hooks for logger plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-info.h b/src/plugins/logger/logger-info.h
index 1d0bbd887..9e791998e 100644
--- a/src/plugins/logger/logger-info.h
+++ b/src/plugins/logger/logger-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-tail.c b/src/plugins/logger/logger-tail.c
index f54eadae4..77d4d2fd3 100644
--- a/src/plugins/logger/logger-tail.c
+++ b/src/plugins/logger/logger-tail.c
@@ -1,7 +1,7 @@
 /*
  * logger-tail.c - return last lines of a file
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger-tail.h b/src/plugins/logger/logger-tail.h
index 5f763276e..d5a14b7da 100644
--- a/src/plugins/logger/logger-tail.h
+++ b/src/plugins/logger/logger-tail.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger.c b/src/plugins/logger/logger.c
index 3daececa4..11e058adf 100644
--- a/src/plugins/logger/logger.c
+++ b/src/plugins/logger/logger.c
@@ -1,7 +1,7 @@
 /*
  * logger.c - logger plugin for WeeChat: save buffer lines to disk files
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/logger/logger.h b/src/plugins/logger/logger.h
index 34dcdd0e7..e98d77172 100644
--- a/src/plugins/logger/logger.h
+++ b/src/plugins/logger/logger.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/lua/CMakeLists.txt b/src/plugins/lua/CMakeLists.txt
index 526efa18d..205c0a77a 100644
--- a/src/plugins/lua/CMakeLists.txt
+++ b/src/plugins/lua/CMakeLists.txt
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
-# Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/lua/weechat-lua-api.c b/src/plugins/lua/weechat-lua-api.c
index 9cd56592f..5e35b304b 100644
--- a/src/plugins/lua/weechat-lua-api.c
+++ b/src/plugins/lua/weechat-lua-api.c
@@ -1,9 +1,9 @@
 /*
  * weechat-lua-api.c - lua API functions
  *
- * Copyright (C) 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/lua/weechat-lua-api.h b/src/plugins/lua/weechat-lua-api.h
index 3b0cf1e56..5a1adabf9 100644
--- a/src/plugins/lua/weechat-lua-api.h
+++ b/src/plugins/lua/weechat-lua-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/lua/weechat-lua.c b/src/plugins/lua/weechat-lua.c
index 8c17f90a1..b38065e74 100644
--- a/src/plugins/lua/weechat-lua.c
+++ b/src/plugins/lua/weechat-lua.c
@@ -1,8 +1,8 @@
 /*
  * weechat-lua.c - lua plugin for WeeChat
  *
- * Copyright (C) 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/lua/weechat-lua.h b/src/plugins/lua/weechat-lua.h
index 22515fc31..96e47683e 100644
--- a/src/plugins/lua/weechat-lua.h
+++ b/src/plugins/lua/weechat-lua.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/perl/CMakeLists.txt b/src/plugins/perl/CMakeLists.txt
index 953bf00b4..738a17c4d 100644
--- a/src/plugins/perl/CMakeLists.txt
+++ b/src/plugins/perl/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/perl/weechat-perl-api.c b/src/plugins/perl/weechat-perl-api.c
index 2d33746b0..4746a0731 100644
--- a/src/plugins/perl/weechat-perl-api.c
+++ b/src/plugins/perl/weechat-perl-api.c
@@ -1,9 +1,9 @@
 /*
  * weechat-perl-api.c - perl API functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2008 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2008 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/perl/weechat-perl-api.h b/src/plugins/perl/weechat-perl-api.h
index b4e1705d6..97794ef3b 100644
--- a/src/plugins/perl/weechat-perl-api.h
+++ b/src/plugins/perl/weechat-perl-api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/perl/weechat-perl.c b/src/plugins/perl/weechat-perl.c
index eac7f6642..93cbb7066 100644
--- a/src/plugins/perl/weechat-perl.c
+++ b/src/plugins/perl/weechat-perl.c
@@ -1,8 +1,8 @@
 /*
  * weechat-perl.c - perl plugin for WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2008 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2008 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/perl/weechat-perl.h b/src/plugins/perl/weechat-perl.h
index 96f44db0b..45af5bbb9 100644
--- a/src/plugins/perl/weechat-perl.h
+++ b/src/plugins/perl/weechat-perl.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/php/CMakeLists.txt b/src/plugins/php/CMakeLists.txt
index d164cfd7a..d30231436 100644
--- a/src/plugins/php/CMakeLists.txt
+++ b/src/plugins/php/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2017 Adam Saponara <as@php.net>
+# SPDX-FileCopyrightText: 2006-2017 Adam Saponara <as@php.net>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/php/weechat-php-api.c b/src/plugins/php/weechat-php-api.c
index 0a67be1d3..46ab9177f 100644
--- a/src/plugins/php/weechat-php-api.c
+++ b/src/plugins/php/weechat-php-api.c
@@ -1,8 +1,8 @@
 /*
  * weechat-php-api.c - PHP API functions
  *
- * Copyright (C) 2006-2017 Adam Saponara <as@php.net>
- * Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2017 Adam Saponara <as@php.net>
+ * SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/php/weechat-php-api.h b/src/plugins/php/weechat-php-api.h
index 088fe34cf..7baf35251 100644
--- a/src/plugins/php/weechat-php-api.h
+++ b/src/plugins/php/weechat-php-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006-2017 Adam Saponara <as@php.net>
- * Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2017 Adam Saponara <as@php.net>
+ * SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/php/weechat-php.c b/src/plugins/php/weechat-php.c
index 951f4bb92..e83978f29 100644
--- a/src/plugins/php/weechat-php.c
+++ b/src/plugins/php/weechat-php.c
@@ -1,8 +1,8 @@
 /*
  * weechat-php.c - PHP plugin for WeeChat
  *
- * Copyright (C) 2006-2017 Adam Saponara <as@php.net>
- * Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2017 Adam Saponara <as@php.net>
+ * SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/php/weechat-php.h b/src/plugins/php/weechat-php.h
index ac47729c8..098030245 100644
--- a/src/plugins/php/weechat-php.h
+++ b/src/plugins/php/weechat-php.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006-2017 Adam Saponara <as@php.net>
- * Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006-2017 Adam Saponara <as@php.net>
+ * SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-api-info.c b/src/plugins/plugin-api-info.c
index 86b18e9ae..94e0f6faa 100644
--- a/src/plugins/plugin-api-info.c
+++ b/src/plugins/plugin-api-info.c
@@ -1,7 +1,7 @@
 /*
  * plugin-api-info.c - extra info functions for plugin API
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-api-info.h b/src/plugins/plugin-api-info.h
index 35a6b6557..08ed3cada 100644
--- a/src/plugins/plugin-api-info.h
+++ b/src/plugins/plugin-api-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-api.c b/src/plugins/plugin-api.c
index 7231c1348..c697485a1 100644
--- a/src/plugins/plugin-api.c
+++ b/src/plugins/plugin-api.c
@@ -1,7 +1,7 @@
 /*
  * plugin-api.c - extra functions for plugin API
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-api.h b/src/plugins/plugin-api.h
index 3ad501ad8..c1e1dafa7 100644
--- a/src/plugins/plugin-api.h
+++ b/src/plugins/plugin-api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-config.c b/src/plugins/plugin-config.c
index dbd7a34e1..7f8211d6b 100644
--- a/src/plugins/plugin-config.c
+++ b/src/plugins/plugin-config.c
@@ -1,7 +1,7 @@
 /*
  * plugin-config.c - plugin configuration options (file plugins.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-config.h b/src/plugins/plugin-config.h
index 2933d0a36..3361cc670 100644
--- a/src/plugins/plugin-config.h
+++ b/src/plugins/plugin-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-script-api.c b/src/plugins/plugin-script-api.c
index 33567bd75..05091ed3a 100644
--- a/src/plugins/plugin-script-api.c
+++ b/src/plugins/plugin-script-api.c
@@ -1,8 +1,8 @@
 /*
  * script-api.c - script API functions, used by script plugins
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-script-api.h b/src/plugins/plugin-script-api.h
index b2cc888a6..1c26197e7 100644
--- a/src/plugins/plugin-script-api.h
+++ b/src/plugins/plugin-script-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-script-config.c b/src/plugins/plugin-script-config.c
index d6ab54f50..7aea2b92e 100644
--- a/src/plugins/plugin-script-config.c
+++ b/src/plugins/plugin-script-config.c
@@ -1,7 +1,7 @@
 /*
  * plugin-script-config.c - configuration options, used by script plugins
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-script-config.h b/src/plugins/plugin-script-config.h
index fbdc353b1..44fafbf18 100644
--- a/src/plugins/plugin-script-config.h
+++ b/src/plugins/plugin-script-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-script.c b/src/plugins/plugin-script.c
index d9c713384..f5cc8c32f 100644
--- a/src/plugins/plugin-script.c
+++ b/src/plugins/plugin-script.c
@@ -1,7 +1,7 @@
 /*
  * plugin-script.c - common functions used by script plugins
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin-script.h b/src/plugins/plugin-script.h
index 735daea03..524bf214f 100644
--- a/src/plugins/plugin-script.h
+++ b/src/plugins/plugin-script.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin.c b/src/plugins/plugin.c
index 16bf2e43e..eccc10af5 100644
--- a/src/plugins/plugin.c
+++ b/src/plugins/plugin.c
@@ -1,7 +1,7 @@
 /*
  * plugin.c - WeeChat plugins management (load/unload dynamic C libraries)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/plugin.h b/src/plugins/plugin.h
index b2b375a4f..5e8a7b79e 100644
--- a/src/plugins/plugin.h
+++ b/src/plugins/plugin.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/python/CMakeLists.txt b/src/plugins/python/CMakeLists.txt
index 990ebf45e..ad21d5ca2 100644
--- a/src/plugins/python/CMakeLists.txt
+++ b/src/plugins/python/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/python/weechat-python-api.c b/src/plugins/python/weechat-python-api.c
index 855072f94..5c3a83223 100644
--- a/src/plugins/python/weechat-python-api.c
+++ b/src/plugins/python/weechat-python-api.c
@@ -1,9 +1,9 @@
 /*
  * weechat-python-api.c - python API functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/python/weechat-python-api.h b/src/plugins/python/weechat-python-api.h
index b4a162b32..86dfbc925 100644
--- a/src/plugins/python/weechat-python-api.h
+++ b/src/plugins/python/weechat-python-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/python/weechat-python.c b/src/plugins/python/weechat-python.c
index 4ae32759b..9bef90f1a 100644
--- a/src/plugins/python/weechat-python.c
+++ b/src/plugins/python/weechat-python.c
@@ -1,9 +1,9 @@
 /*
  * weechat-python.c - python plugin for WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/python/weechat-python.h b/src/plugins/python/weechat-python.h
index 547d94400..22911b930 100644
--- a/src/plugins/python/weechat-python.h
+++ b/src/plugins/python/weechat-python.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/CMakeLists.txt b/src/plugins/relay/CMakeLists.txt
index ec9e1b0a7..efdcf1c31 100644
--- a/src/plugins/relay/CMakeLists.txt
+++ b/src/plugins/relay/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/relay/api/relay-api-msg.c b/src/plugins/relay/api/relay-api-msg.c
index 7c9b6f182..00738de04 100644
--- a/src/plugins/relay/api/relay-api-msg.c
+++ b/src/plugins/relay/api/relay-api-msg.c
@@ -1,7 +1,7 @@
 /*
  * relay-api-msg.c - build JSON messages for "api" protocol
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/relay-api-msg.h b/src/plugins/relay/api/relay-api-msg.h
index 41f0b1929..0e5cba7c8 100644
--- a/src/plugins/relay/api/relay-api-msg.h
+++ b/src/plugins/relay/api/relay-api-msg.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/relay-api-protocol.c b/src/plugins/relay/api/relay-api-protocol.c
index 334c2f4d5..f1a2b53e5 100644
--- a/src/plugins/relay/api/relay-api-protocol.c
+++ b/src/plugins/relay/api/relay-api-protocol.c
@@ -1,7 +1,7 @@
 /*
  * relay-api-protocol.c - API protocol for relay to client
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/relay-api-protocol.h b/src/plugins/relay/api/relay-api-protocol.h
index efae52969..87f59449c 100644
--- a/src/plugins/relay/api/relay-api-protocol.h
+++ b/src/plugins/relay/api/relay-api-protocol.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/relay-api.c b/src/plugins/relay/api/relay-api.c
index a22754f6f..c483111ba 100644
--- a/src/plugins/relay/api/relay-api.c
+++ b/src/plugins/relay/api/relay-api.c
@@ -1,7 +1,7 @@
 /*
  * relay-api.c - API protocol for relay to client
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/relay-api.h b/src/plugins/relay/api/relay-api.h
index 78082d27d..2039213a5 100644
--- a/src/plugins/relay/api/relay-api.h
+++ b/src/plugins/relay/api/relay-api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/remote/relay-remote-event.c b/src/plugins/relay/api/remote/relay-remote-event.c
index 6d9959446..be52713bc 100644
--- a/src/plugins/relay/api/remote/relay-remote-event.c
+++ b/src/plugins/relay/api/remote/relay-remote-event.c
@@ -1,7 +1,7 @@
 /*
  * relay-remote-event.c - process events received from relay remote
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/remote/relay-remote-event.h b/src/plugins/relay/api/remote/relay-remote-event.h
index b4285965e..0df25ed7a 100644
--- a/src/plugins/relay/api/remote/relay-remote-event.h
+++ b/src/plugins/relay/api/remote/relay-remote-event.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/remote/relay-remote-network.c b/src/plugins/relay/api/remote/relay-remote-network.c
index c8a93aff4..c8c1ebe92 100644
--- a/src/plugins/relay/api/remote/relay-remote-network.c
+++ b/src/plugins/relay/api/remote/relay-remote-network.c
@@ -1,7 +1,7 @@
 /*
  * relay-remote-network.c - network functions for relay remote
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/api/remote/relay-remote-network.h b/src/plugins/relay/api/remote/relay-remote-network.h
index 9bf2404c0..a66c72d33 100644
--- a/src/plugins/relay/api/remote/relay-remote-network.h
+++ b/src/plugins/relay/api/remote/relay-remote-network.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/irc/relay-irc.c b/src/plugins/relay/irc/relay-irc.c
index ba9f3982e..b9a702018 100644
--- a/src/plugins/relay/irc/relay-irc.c
+++ b/src/plugins/relay/irc/relay-irc.c
@@ -1,7 +1,7 @@
 /*
  * relay-irc.c - IRC protocol for relay to client: IRC proxy/bouncer
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/irc/relay-irc.h b/src/plugins/relay/irc/relay-irc.h
index 736f4ef7f..d5c29af5c 100644
--- a/src/plugins/relay/irc/relay-irc.h
+++ b/src/plugins/relay/irc/relay-irc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-auth.c b/src/plugins/relay/relay-auth.c
index 5b883b9cf..dd0bd2d8a 100644
--- a/src/plugins/relay/relay-auth.c
+++ b/src/plugins/relay/relay-auth.c
@@ -1,7 +1,7 @@
 /*
  * relay-auth.c - relay client authentication
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-auth.h b/src/plugins/relay/relay-auth.h
index d20f627f0..3ba7917ef 100644
--- a/src/plugins/relay/relay-auth.h
+++ b/src/plugins/relay/relay-auth.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-bar-item.c b/src/plugins/relay/relay-bar-item.c
index 3dbbc8ffa..df57ee545 100644
--- a/src/plugins/relay/relay-bar-item.c
+++ b/src/plugins/relay/relay-bar-item.c
@@ -1,7 +1,7 @@
 /*
  * relay-bar-item.c - bar items for relay plugin
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-bar-item.h b/src/plugins/relay/relay-bar-item.h
index 4da118ed5..dad5b9885 100644
--- a/src/plugins/relay/relay-bar-item.h
+++ b/src/plugins/relay/relay-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-buffer.c b/src/plugins/relay/relay-buffer.c
index e084218ec..ef27dae2b 100644
--- a/src/plugins/relay/relay-buffer.c
+++ b/src/plugins/relay/relay-buffer.c
@@ -1,7 +1,7 @@
 /*
  * relay-buffer.c - display clients list on relay buffer
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-buffer.h b/src/plugins/relay/relay-buffer.h
index 899af9e68..108aa23d7 100644
--- a/src/plugins/relay/relay-buffer.h
+++ b/src/plugins/relay/relay-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-client.c b/src/plugins/relay/relay-client.c
index dfa0bb984..e4595d6e0 100644
--- a/src/plugins/relay/relay-client.c
+++ b/src/plugins/relay/relay-client.c
@@ -1,7 +1,7 @@
 /*
  * relay-client.c - client functions for relay plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-client.h b/src/plugins/relay/relay-client.h
index ae19ef606..98708a896 100644
--- a/src/plugins/relay/relay-client.h
+++ b/src/plugins/relay/relay-client.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-command.c b/src/plugins/relay/relay-command.c
index 9385e5af6..828b6255f 100644
--- a/src/plugins/relay/relay-command.c
+++ b/src/plugins/relay/relay-command.c
@@ -1,7 +1,7 @@
 /*
  * relay-command.c - relay commands
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-command.h b/src/plugins/relay/relay-command.h
index 53c682c26..3223f1fc1 100644
--- a/src/plugins/relay/relay-command.h
+++ b/src/plugins/relay/relay-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-completion.c b/src/plugins/relay/relay-completion.c
index e847a1da5..97b21ee3d 100644
--- a/src/plugins/relay/relay-completion.c
+++ b/src/plugins/relay/relay-completion.c
@@ -1,7 +1,7 @@
 /*
  * relay-completion.c - completion for relay command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-completion.h b/src/plugins/relay/relay-completion.h
index 4bd0d63c4..203406a7e 100644
--- a/src/plugins/relay/relay-completion.h
+++ b/src/plugins/relay/relay-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-config.c b/src/plugins/relay/relay-config.c
index b57cf210e..5a815f46e 100644
--- a/src/plugins/relay/relay-config.c
+++ b/src/plugins/relay/relay-config.c
@@ -1,7 +1,7 @@
 /*
  * relay-config.c - relay configuration options (file relay.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-config.h b/src/plugins/relay/relay-config.h
index d35c7ffa2..db25abe18 100644
--- a/src/plugins/relay/relay-config.h
+++ b/src/plugins/relay/relay-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-http.c b/src/plugins/relay/relay-http.c
index e60d926e0..a87739d56 100644
--- a/src/plugins/relay/relay-http.c
+++ b/src/plugins/relay/relay-http.c
@@ -1,7 +1,7 @@
 /*
  * relay-http.c - HTTP request parser for relay plugin
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-http.h b/src/plugins/relay/relay-http.h
index 65f8d46ad..6e6e13338 100644
--- a/src/plugins/relay/relay-http.h
+++ b/src/plugins/relay/relay-http.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-info.c b/src/plugins/relay/relay-info.c
index 097bd3a36..4c97b722b 100644
--- a/src/plugins/relay/relay-info.c
+++ b/src/plugins/relay/relay-info.c
@@ -1,7 +1,7 @@
 /*
  * relay-info.c - info and infolist hooks for relay plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-info.h b/src/plugins/relay/relay-info.h
index 89d0cd9bd..11ed2c47c 100644
--- a/src/plugins/relay/relay-info.h
+++ b/src/plugins/relay/relay-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-network.c b/src/plugins/relay/relay-network.c
index 7c0ffc646..35889ad48 100644
--- a/src/plugins/relay/relay-network.c
+++ b/src/plugins/relay/relay-network.c
@@ -1,7 +1,7 @@
 /*
  * relay-network.c - network functions for relay plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-network.h b/src/plugins/relay/relay-network.h
index e1655e6c4..9b5b948df 100644
--- a/src/plugins/relay/relay-network.h
+++ b/src/plugins/relay/relay-network.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-raw.c b/src/plugins/relay/relay-raw.c
index e9bbaa24f..a0931ffe1 100644
--- a/src/plugins/relay/relay-raw.c
+++ b/src/plugins/relay/relay-raw.c
@@ -1,7 +1,7 @@
 /*
  * relay-raw.c - functions for Relay raw data messages
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-raw.h b/src/plugins/relay/relay-raw.h
index baab609fa..0e63944f7 100644
--- a/src/plugins/relay/relay-raw.h
+++ b/src/plugins/relay/relay-raw.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-remote.c b/src/plugins/relay/relay-remote.c
index 92b3e488f..10497dfee 100644
--- a/src/plugins/relay/relay-remote.c
+++ b/src/plugins/relay/relay-remote.c
@@ -1,7 +1,7 @@
 /*
  * relay-remote.c - remote relay server functions for relay plugin
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-remote.h b/src/plugins/relay/relay-remote.h
index a9ead681a..9045eb75e 100644
--- a/src/plugins/relay/relay-remote.h
+++ b/src/plugins/relay/relay-remote.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-server.c b/src/plugins/relay/relay-server.c
index 05cdfc12b..ca7185db6 100644
--- a/src/plugins/relay/relay-server.c
+++ b/src/plugins/relay/relay-server.c
@@ -1,7 +1,7 @@
 /*
  * relay-server.c - server functions for relay plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-server.h b/src/plugins/relay/relay-server.h
index e473dace8..c042fd45e 100644
--- a/src/plugins/relay/relay-server.h
+++ b/src/plugins/relay/relay-server.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-upgrade.c b/src/plugins/relay/relay-upgrade.c
index 66f8ec802..ac1088981 100644
--- a/src/plugins/relay/relay-upgrade.c
+++ b/src/plugins/relay/relay-upgrade.c
@@ -1,7 +1,7 @@
 /*
  * relay-upgrade.c - save/restore relay plugin data when upgrading WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-upgrade.h b/src/plugins/relay/relay-upgrade.h
index 7c70fd5b8..d55321abe 100644
--- a/src/plugins/relay/relay-upgrade.h
+++ b/src/plugins/relay/relay-upgrade.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-websocket.c b/src/plugins/relay/relay-websocket.c
index a6cebfdcc..347911506 100644
--- a/src/plugins/relay/relay-websocket.c
+++ b/src/plugins/relay/relay-websocket.c
@@ -1,7 +1,7 @@
 /*
  * relay-websocket.c - websocket server functions for relay plugin (RFC 6455)
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay-websocket.h b/src/plugins/relay/relay-websocket.h
index 4b1a36f44..2658534ad 100644
--- a/src/plugins/relay/relay-websocket.h
+++ b/src/plugins/relay/relay-websocket.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay.c b/src/plugins/relay/relay.c
index a7a5feea8..0e019c726 100644
--- a/src/plugins/relay/relay.c
+++ b/src/plugins/relay/relay.c
@@ -1,7 +1,7 @@
 /*
  * relay.c - network communication between WeeChat and remote client
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/relay.h b/src/plugins/relay/relay.h
index 1c62c09c4..b1f63ca0d 100644
--- a/src/plugins/relay/relay.h
+++ b/src/plugins/relay/relay.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat-msg.c b/src/plugins/relay/weechat/relay-weechat-msg.c
index 212751cc6..f8e124101 100644
--- a/src/plugins/relay/weechat/relay-weechat-msg.c
+++ b/src/plugins/relay/weechat/relay-weechat-msg.c
@@ -1,7 +1,7 @@
 /*
  * relay-weechat-msg.c - build binary messages for WeeChat protocol
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat-msg.h b/src/plugins/relay/weechat/relay-weechat-msg.h
index d33cddc39..a251f3f73 100644
--- a/src/plugins/relay/weechat/relay-weechat-msg.h
+++ b/src/plugins/relay/weechat/relay-weechat-msg.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat-nicklist.c b/src/plugins/relay/weechat/relay-weechat-nicklist.c
index 1268f733c..1df42926d 100644
--- a/src/plugins/relay/weechat/relay-weechat-nicklist.c
+++ b/src/plugins/relay/weechat/relay-weechat-nicklist.c
@@ -1,7 +1,7 @@
 /*
  * relay-weechat-nicklist.c - nicklist functions for WeeChat protocol
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat-nicklist.h b/src/plugins/relay/weechat/relay-weechat-nicklist.h
index 041e8428b..ea6cb8861 100644
--- a/src/plugins/relay/weechat/relay-weechat-nicklist.h
+++ b/src/plugins/relay/weechat/relay-weechat-nicklist.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat-protocol.c b/src/plugins/relay/weechat/relay-weechat-protocol.c
index 98f608162..4095118e8 100644
--- a/src/plugins/relay/weechat/relay-weechat-protocol.c
+++ b/src/plugins/relay/weechat/relay-weechat-protocol.c
@@ -1,7 +1,7 @@
 /*
  * relay-weechat-protocol.c - WeeChat protocol for relay to client
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat-protocol.h b/src/plugins/relay/weechat/relay-weechat-protocol.h
index fdac38b1e..cad1a2e27 100644
--- a/src/plugins/relay/weechat/relay-weechat-protocol.h
+++ b/src/plugins/relay/weechat/relay-weechat-protocol.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat.c b/src/plugins/relay/weechat/relay-weechat.c
index bf2cbc5f9..f24431176 100644
--- a/src/plugins/relay/weechat/relay-weechat.c
+++ b/src/plugins/relay/weechat/relay-weechat.c
@@ -1,7 +1,7 @@
 /*
  * relay-weechat.c - WeeChat protocol for relay to client
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/relay/weechat/relay-weechat.h b/src/plugins/relay/weechat/relay-weechat.h
index fc775d2f3..99493f404 100644
--- a/src/plugins/relay/weechat/relay-weechat.h
+++ b/src/plugins/relay/weechat/relay-weechat.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/ruby/CMakeLists.txt b/src/plugins/ruby/CMakeLists.txt
index 935b92843..4f474e895 100644
--- a/src/plugins/ruby/CMakeLists.txt
+++ b/src/plugins/ruby/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/ruby/weechat-ruby-api.c b/src/plugins/ruby/weechat-ruby-api.c
index 2594ff7d6..ea6143be4 100644
--- a/src/plugins/ruby/weechat-ruby-api.c
+++ b/src/plugins/ruby/weechat-ruby-api.c
@@ -1,9 +1,9 @@
 /*
  * weechat-ruby-api.c - ruby API functions
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/ruby/weechat-ruby-api.h b/src/plugins/ruby/weechat-ruby-api.h
index f2b1f492b..8e399d0a1 100644
--- a/src/plugins/ruby/weechat-ruby-api.h
+++ b/src/plugins/ruby/weechat-ruby-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/ruby/weechat-ruby.c b/src/plugins/ruby/weechat-ruby.c
index 21e7ec572..006148c6f 100644
--- a/src/plugins/ruby/weechat-ruby.c
+++ b/src/plugins/ruby/weechat-ruby.c
@@ -1,8 +1,8 @@
 /*
  * weechat-ruby.c - ruby plugin for WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/ruby/weechat-ruby.h b/src/plugins/ruby/weechat-ruby.h
index 092f971fa..2141c5d75 100644
--- a/src/plugins/ruby/weechat-ruby.h
+++ b/src/plugins/ruby/weechat-ruby.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2005-2007 Emmanuel Bouthenot <kolter@openics.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/CMakeLists.txt b/src/plugins/script/CMakeLists.txt
index 68a416f01..09a1ac547 100644
--- a/src/plugins/script/CMakeLists.txt
+++ b/src/plugins/script/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/script/script-action.c b/src/plugins/script/script-action.c
index 2d6de5b2e..8b13433e4 100644
--- a/src/plugins/script/script-action.c
+++ b/src/plugins/script/script-action.c
@@ -1,7 +1,7 @@
 /*
  * script-action.c - actions on scripts
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-action.h b/src/plugins/script/script-action.h
index 6211691bc..bc8c72f41 100644
--- a/src/plugins/script/script-action.h
+++ b/src/plugins/script/script-action.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-buffer.c b/src/plugins/script/script-buffer.c
index 4e3def62e..86ed22e77 100644
--- a/src/plugins/script/script-buffer.c
+++ b/src/plugins/script/script-buffer.c
@@ -1,7 +1,7 @@
 /*
  * script-buffer.c - display scripts on script buffer
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-buffer.h b/src/plugins/script/script-buffer.h
index 7776d56c2..40508c030 100644
--- a/src/plugins/script/script-buffer.h
+++ b/src/plugins/script/script-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-command.c b/src/plugins/script/script-command.c
index a620ba712..bade61570 100644
--- a/src/plugins/script/script-command.c
+++ b/src/plugins/script/script-command.c
@@ -1,7 +1,7 @@
 /*
  * script-command.c - script command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-command.h b/src/plugins/script/script-command.h
index 17ec99ddf..fc8a78e87 100644
--- a/src/plugins/script/script-command.h
+++ b/src/plugins/script/script-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-completion.c b/src/plugins/script/script-completion.c
index e54ac3fed..6ecda92fd 100644
--- a/src/plugins/script/script-completion.c
+++ b/src/plugins/script/script-completion.c
@@ -1,7 +1,7 @@
 /*
  * script-completion.c - completions for script command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-completion.h b/src/plugins/script/script-completion.h
index 888533ddd..8198bd531 100644
--- a/src/plugins/script/script-completion.h
+++ b/src/plugins/script/script-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-config.c b/src/plugins/script/script-config.c
index 878c36cdb..18f1dd62d 100644
--- a/src/plugins/script/script-config.c
+++ b/src/plugins/script/script-config.c
@@ -1,7 +1,7 @@
 /*
  * script-config.c - script configuration options (file script.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-config.h b/src/plugins/script/script-config.h
index d7853bd01..255414d0e 100644
--- a/src/plugins/script/script-config.h
+++ b/src/plugins/script/script-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-info.c b/src/plugins/script/script-info.c
index 52be74e37..af25ae31a 100644
--- a/src/plugins/script/script-info.c
+++ b/src/plugins/script/script-info.c
@@ -1,7 +1,7 @@
 /*
  * script-info.c - info, infolist and hdata hooks for script plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-info.h b/src/plugins/script/script-info.h
index 966cfe459..5b266db43 100644
--- a/src/plugins/script/script-info.h
+++ b/src/plugins/script/script-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-mouse.c b/src/plugins/script/script-mouse.c
index b26392417..a6cf0a4c1 100644
--- a/src/plugins/script/script-mouse.c
+++ b/src/plugins/script/script-mouse.c
@@ -1,7 +1,7 @@
 /*
  * script-mouse.c - mouse actions for script
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-mouse.h b/src/plugins/script/script-mouse.h
index 12137d797..c02436b7f 100644
--- a/src/plugins/script/script-mouse.h
+++ b/src/plugins/script/script-mouse.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-repo.c b/src/plugins/script/script-repo.c
index 37f13d5e4..9945ef2f0 100644
--- a/src/plugins/script/script-repo.c
+++ b/src/plugins/script/script-repo.c
@@ -1,7 +1,7 @@
 /*
  * script-repo.c - download and read repository file (plugins.xml.gz)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script-repo.h b/src/plugins/script/script-repo.h
index e6460a1ad..60a2a4276 100644
--- a/src/plugins/script/script-repo.h
+++ b/src/plugins/script/script-repo.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script.c b/src/plugins/script/script.c
index d1928c0e1..1a87702f6 100644
--- a/src/plugins/script/script.c
+++ b/src/plugins/script/script.c
@@ -1,7 +1,7 @@
 /*
  * script.c - script manager for WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/script/script.h b/src/plugins/script/script.h
index 95a1397c5..2af48f594 100644
--- a/src/plugins/script/script.h
+++ b/src/plugins/script/script.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/CMakeLists.txt b/src/plugins/spell/CMakeLists.txt
index 5442dfc09..9adaebc1c 100644
--- a/src/plugins/spell/CMakeLists.txt
+++ b/src/plugins/spell/CMakeLists.txt
@@ -1,6 +1,6 @@
 #
-# Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
-# Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+# SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/spell/spell-bar-item.c b/src/plugins/spell/spell-bar-item.c
index feeb48bb2..3292c1fa9 100644
--- a/src/plugins/spell/spell-bar-item.c
+++ b/src/plugins/spell/spell-bar-item.c
@@ -1,8 +1,8 @@
 /*
  * spell-bar-item.c - bar items for spell checker plugin
  *
- * Copyright (C) 2012 Nils Görs <weechatter@arcor.de>
- * Copyright (C) 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Nils Görs <weechatter@arcor.de>
+ * SPDX-FileCopyrightText: 2012-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-bar-item.h b/src/plugins/spell/spell-bar-item.h
index e16f46ea5..b8db3c5f0 100644
--- a/src/plugins/spell/spell-bar-item.h
+++ b/src/plugins/spell/spell-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Nils Görs <weechatter@arcor.de>
+ * SPDX-FileCopyrightText: 2012 Nils Görs <weechatter@arcor.de>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-command.c b/src/plugins/spell/spell-command.c
index f5c400474..1ef9b1676 100644
--- a/src/plugins/spell/spell-command.c
+++ b/src/plugins/spell/spell-command.c
@@ -1,7 +1,7 @@
 /*
  * spell-command.c - spell checker commands
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-command.h b/src/plugins/spell/spell-command.h
index fcc081319..916119cc4 100644
--- a/src/plugins/spell/spell-command.h
+++ b/src/plugins/spell/spell-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-completion.c b/src/plugins/spell/spell-completion.c
index c93cde05e..cbe8a2a92 100644
--- a/src/plugins/spell/spell-completion.c
+++ b/src/plugins/spell/spell-completion.c
@@ -1,7 +1,7 @@
 /*
  * spell-completion.c - completion for spell checker commands
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-completion.h b/src/plugins/spell/spell-completion.h
index 7d5786f80..aca5c5216 100644
--- a/src/plugins/spell/spell-completion.h
+++ b/src/plugins/spell/spell-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-config.c b/src/plugins/spell/spell-config.c
index 774433370..8233803c9 100644
--- a/src/plugins/spell/spell-config.c
+++ b/src/plugins/spell/spell-config.c
@@ -1,8 +1,8 @@
 /*
  * spell-config.c - spell checker configuration options (file spell.conf)
  *
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-config.h b/src/plugins/spell/spell-config.h
index 1416f0d5c..36536c202 100644
--- a/src/plugins/spell/spell-config.h
+++ b/src/plugins/spell/spell-config.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-info.c b/src/plugins/spell/spell-info.c
index 0762b7c92..1c5fddf33 100644
--- a/src/plugins/spell/spell-info.c
+++ b/src/plugins/spell/spell-info.c
@@ -1,7 +1,7 @@
 /*
  * spell-info.c - info for spell checker plugin
  *
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-info.h b/src/plugins/spell/spell-info.h
index c07e053e0..19b09e401 100644
--- a/src/plugins/spell/spell-info.h
+++ b/src/plugins/spell/spell-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-speller.c b/src/plugins/spell/spell-speller.c
index 482edb420..6c42962b0 100644
--- a/src/plugins/spell/spell-speller.c
+++ b/src/plugins/spell/spell-speller.c
@@ -1,8 +1,8 @@
 /*
  * spell-speller.c - speller management for spell checker plugin
  *
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell-speller.h b/src/plugins/spell/spell-speller.h
index 802a3dcaf..4117f2864 100644
--- a/src/plugins/spell/spell-speller.h
+++ b/src/plugins/spell/spell-speller.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell.c b/src/plugins/spell/spell.c
index 9e6848168..b4d48be14 100644
--- a/src/plugins/spell/spell.c
+++ b/src/plugins/spell/spell.c
@@ -1,9 +1,9 @@
 /*
  * spell.c - spell checker plugin for WeeChat
  *
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Nils Görs <weechatter@arcor.de>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Nils Görs <weechatter@arcor.de>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/spell/spell.h b/src/plugins/spell/spell.h
index 1e90948c0..08ac95e8d 100644
--- a/src/plugins/spell/spell.h
+++ b/src/plugins/spell/spell.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
- * Copyright (C) 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2006 Emmanuel Bouthenot <kolter@openics.org>
+ * SPDX-FileCopyrightText: 2006-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/tcl/CMakeLists.txt b/src/plugins/tcl/CMakeLists.txt
index 62652fade..deb1b899e 100644
--- a/src/plugins/tcl/CMakeLists.txt
+++ b/src/plugins/tcl/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
-# Copyright (C) 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
-# Copyright (C) 2008 Julien Louis <ptitlouis@sysif.net>
-# Copyright (C) 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
+# SPDX-FileCopyrightText: 2008 Julien Louis <ptitlouis@sysif.net>
+# SPDX-FileCopyrightText: 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/tcl/weechat-tcl-api.c b/src/plugins/tcl/weechat-tcl-api.c
index 5b675f377..2925e1cd5 100644
--- a/src/plugins/tcl/weechat-tcl-api.c
+++ b/src/plugins/tcl/weechat-tcl-api.c
@@ -1,10 +1,10 @@
 /*
  * weechat-tcl-api.c - tcl API functions
  *
- * Copyright (C) 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
- * Copyright (C) 2008 Julien Louis <ptitlouis@sysif.net>
- * Copyright (C) 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
- * Copyright (C) 2012 Simon Arlott
+ * SPDX-FileCopyrightText: 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
+ * SPDX-FileCopyrightText: 2008 Julien Louis <ptitlouis@sysif.net>
+ * SPDX-FileCopyrightText: 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2012 Simon Arlott
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/tcl/weechat-tcl-api.h b/src/plugins/tcl/weechat-tcl-api.h
index 23ff441c0..d66e9e68d 100644
--- a/src/plugins/tcl/weechat-tcl-api.h
+++ b/src/plugins/tcl/weechat-tcl-api.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
- * Copyright (C) 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
+ * SPDX-FileCopyrightText: 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/tcl/weechat-tcl.c b/src/plugins/tcl/weechat-tcl.c
index 34a04a992..36eb8394e 100644
--- a/src/plugins/tcl/weechat-tcl.c
+++ b/src/plugins/tcl/weechat-tcl.c
@@ -1,8 +1,8 @@
 /*
  * weechat-tcl.c - tcl plugin for WeeChat
  *
- * Copyright (C) 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
- * Copyright (C) 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
+ * SPDX-FileCopyrightText: 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/tcl/weechat-tcl.h b/src/plugins/tcl/weechat-tcl.h
index 2d40184fd..8dcdb0139 100644
--- a/src/plugins/tcl/weechat-tcl.h
+++ b/src/plugins/tcl/weechat-tcl.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
- * Copyright (C) 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2008-2010 Dmitry Kobylin <fnfal@academ.tsc.ru>
+ * SPDX-FileCopyrightText: 2008-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/CMakeLists.txt b/src/plugins/trigger/CMakeLists.txt
index cea8fa677..f8bc5da8b 100644
--- a/src/plugins/trigger/CMakeLists.txt
+++ b/src/plugins/trigger/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/trigger/trigger-buffer.c b/src/plugins/trigger/trigger-buffer.c
index c04f8e18e..225ca64e6 100644
--- a/src/plugins/trigger/trigger-buffer.c
+++ b/src/plugins/trigger/trigger-buffer.c
@@ -1,7 +1,7 @@
 /*
  * trigger-buffer.c - debug buffer for triggers
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-buffer.h b/src/plugins/trigger/trigger-buffer.h
index 5c2094c13..bfcd92fa5 100644
--- a/src/plugins/trigger/trigger-buffer.h
+++ b/src/plugins/trigger/trigger-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-callback.c b/src/plugins/trigger/trigger-callback.c
index 6e7f650bb..910c39cce 100644
--- a/src/plugins/trigger/trigger-callback.c
+++ b/src/plugins/trigger/trigger-callback.c
@@ -1,7 +1,7 @@
 /*
  * trigger-callback.c - callbacks for triggers
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-callback.h b/src/plugins/trigger/trigger-callback.h
index b4b04b40a..e29fcb265 100644
--- a/src/plugins/trigger/trigger-callback.h
+++ b/src/plugins/trigger/trigger-callback.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-command.c b/src/plugins/trigger/trigger-command.c
index e29df3703..9ab0677c7 100644
--- a/src/plugins/trigger/trigger-command.c
+++ b/src/plugins/trigger/trigger-command.c
@@ -1,7 +1,7 @@
 /*
  * trigger-command.c - trigger command
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-command.h b/src/plugins/trigger/trigger-command.h
index 3d3c73ad8..4b9065657 100644
--- a/src/plugins/trigger/trigger-command.h
+++ b/src/plugins/trigger/trigger-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-completion.c b/src/plugins/trigger/trigger-completion.c
index 77cc97170..acd69e351 100644
--- a/src/plugins/trigger/trigger-completion.c
+++ b/src/plugins/trigger/trigger-completion.c
@@ -1,7 +1,7 @@
 /*
  * trigger-completion.c - completion for trigger commands
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-completion.h b/src/plugins/trigger/trigger-completion.h
index 30e17fd8c..3e41d5487 100644
--- a/src/plugins/trigger/trigger-completion.h
+++ b/src/plugins/trigger/trigger-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-config.c b/src/plugins/trigger/trigger-config.c
index a1b6825a5..dd63f1606 100644
--- a/src/plugins/trigger/trigger-config.c
+++ b/src/plugins/trigger/trigger-config.c
@@ -1,7 +1,7 @@
 /*
  * trigger-config.c - trigger configuration options (file trigger.conf)
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger-config.h b/src/plugins/trigger/trigger-config.h
index d34d03ab5..bf4babef5 100644
--- a/src/plugins/trigger/trigger-config.h
+++ b/src/plugins/trigger/trigger-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger.c b/src/plugins/trigger/trigger.c
index 77c6481d7..c747dac05 100644
--- a/src/plugins/trigger/trigger.c
+++ b/src/plugins/trigger/trigger.c
@@ -1,7 +1,7 @@
 /*
  * trigger.c - trigger plugin for WeeChat
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/trigger/trigger.h b/src/plugins/trigger/trigger.h
index b9bfb2f15..a2aa4b3fc 100644
--- a/src/plugins/trigger/trigger.h
+++ b/src/plugins/trigger/trigger.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/CMakeLists.txt b/src/plugins/typing/CMakeLists.txt
index 251f2d57c..9474ca24c 100644
--- a/src/plugins/typing/CMakeLists.txt
+++ b/src/plugins/typing/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/typing/typing-bar-item.c b/src/plugins/typing/typing-bar-item.c
index e821498a9..1d44d9650 100644
--- a/src/plugins/typing/typing-bar-item.c
+++ b/src/plugins/typing/typing-bar-item.c
@@ -1,7 +1,7 @@
 /*
  * typing-bar-item.c - bar items for typing plugin
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing-bar-item.h b/src/plugins/typing/typing-bar-item.h
index c08d37423..ab090aee5 100644
--- a/src/plugins/typing/typing-bar-item.h
+++ b/src/plugins/typing/typing-bar-item.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing-config.c b/src/plugins/typing/typing-config.c
index 4cb3d541b..ca9174847 100644
--- a/src/plugins/typing/typing-config.c
+++ b/src/plugins/typing/typing-config.c
@@ -1,7 +1,7 @@
 /*
  * typing-config.c - typing configuration options (file typing.conf)
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing-config.h b/src/plugins/typing/typing-config.h
index 381ac51e6..c11cca872 100644
--- a/src/plugins/typing/typing-config.h
+++ b/src/plugins/typing/typing-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing-status.c b/src/plugins/typing/typing-status.c
index 8d39277ac..496bf6047 100644
--- a/src/plugins/typing/typing-status.c
+++ b/src/plugins/typing/typing-status.c
@@ -1,7 +1,7 @@
 /*
  * typing-status.c - manage self and other users typing status
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing-status.h b/src/plugins/typing/typing-status.h
index 9b02fbce4..395ed1b86 100644
--- a/src/plugins/typing/typing-status.h
+++ b/src/plugins/typing/typing-status.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing.c b/src/plugins/typing/typing.c
index b054280e4..afc3b66d6 100644
--- a/src/plugins/typing/typing.c
+++ b/src/plugins/typing/typing.c
@@ -1,7 +1,7 @@
 /*
  * typing.c - manage typing status of users
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/typing/typing.h b/src/plugins/typing/typing.h
index 83b495cbb..2a065556c 100644
--- a/src/plugins/typing/typing.h
+++ b/src/plugins/typing/typing.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/weechat-plugin.h b/src/plugins/weechat-plugin.h
index 162ca5110..1af983095 100644
--- a/src/plugins/weechat-plugin.h
+++ b/src/plugins/weechat-plugin.h
@@ -1,7 +1,7 @@
 /*
  * weechat-plugin.h - header to compile WeeChat plugins
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/CMakeLists.txt b/src/plugins/xfer/CMakeLists.txt
index 4552bdec6..7bfaf9ca3 100644
--- a/src/plugins/xfer/CMakeLists.txt
+++ b/src/plugins/xfer/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/src/plugins/xfer/xfer-buffer.c b/src/plugins/xfer/xfer-buffer.c
index 77c17cd09..e3222c5ff 100644
--- a/src/plugins/xfer/xfer-buffer.c
+++ b/src/plugins/xfer/xfer-buffer.c
@@ -1,7 +1,7 @@
 /*
  * xfer-buffer.c - display xfer list on xfer buffer
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-buffer.h b/src/plugins/xfer/xfer-buffer.h
index 11c4bcfbf..24f9ca70f 100644
--- a/src/plugins/xfer/xfer-buffer.h
+++ b/src/plugins/xfer/xfer-buffer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-chat.c b/src/plugins/xfer/xfer-chat.c
index b9c779f47..f2530dfea 100644
--- a/src/plugins/xfer/xfer-chat.c
+++ b/src/plugins/xfer/xfer-chat.c
@@ -1,7 +1,7 @@
 /*
  * xfer-chat.c - chat with direct connection to remote host
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-chat.h b/src/plugins/xfer/xfer-chat.h
index cca8a0758..2b907c46b 100644
--- a/src/plugins/xfer/xfer-chat.h
+++ b/src/plugins/xfer/xfer-chat.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-command.c b/src/plugins/xfer/xfer-command.c
index ac232759f..3b9ed9149 100644
--- a/src/plugins/xfer/xfer-command.c
+++ b/src/plugins/xfer/xfer-command.c
@@ -1,7 +1,7 @@
 /*
  * xfer-command.c - xfer command
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-command.h b/src/plugins/xfer/xfer-command.h
index fc1cd556e..a5167d99f 100644
--- a/src/plugins/xfer/xfer-command.h
+++ b/src/plugins/xfer/xfer-command.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-completion.c b/src/plugins/xfer/xfer-completion.c
index 5b8f21b59..0fb962ae7 100644
--- a/src/plugins/xfer/xfer-completion.c
+++ b/src/plugins/xfer/xfer-completion.c
@@ -1,7 +1,7 @@
 /*
  * xfer-completion.c - nick completion for xfer chats
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-completion.h b/src/plugins/xfer/xfer-completion.h
index 9928b4ecc..9351c5a3b 100644
--- a/src/plugins/xfer/xfer-completion.h
+++ b/src/plugins/xfer/xfer-completion.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-config.c b/src/plugins/xfer/xfer-config.c
index 7b078a83d..42bb388bf 100644
--- a/src/plugins/xfer/xfer-config.c
+++ b/src/plugins/xfer/xfer-config.c
@@ -1,7 +1,7 @@
 /*
  * xfer-config.c - xfer configuration options (file xfer.conf)
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-config.h b/src/plugins/xfer/xfer-config.h
index 1d0270a8c..3ca2070ba 100644
--- a/src/plugins/xfer/xfer-config.h
+++ b/src/plugins/xfer/xfer-config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-dcc.c b/src/plugins/xfer/xfer-dcc.c
index 2503d094a..a29f0a187 100644
--- a/src/plugins/xfer/xfer-dcc.c
+++ b/src/plugins/xfer/xfer-dcc.c
@@ -1,7 +1,7 @@
 /*
  * xfer-dcc.c - file transfer via DCC protocol
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-dcc.h b/src/plugins/xfer/xfer-dcc.h
index a55802a74..cf2e4b509 100644
--- a/src/plugins/xfer/xfer-dcc.h
+++ b/src/plugins/xfer/xfer-dcc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-file.c b/src/plugins/xfer/xfer-file.c
index cf4663c7e..7a396bac9 100644
--- a/src/plugins/xfer/xfer-file.c
+++ b/src/plugins/xfer/xfer-file.c
@@ -1,7 +1,7 @@
 /*
  * xfer-file.c - file functions for xfer plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-file.h b/src/plugins/xfer/xfer-file.h
index f059f88b9..98dcef3d3 100644
--- a/src/plugins/xfer/xfer-file.h
+++ b/src/plugins/xfer/xfer-file.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-info.c b/src/plugins/xfer/xfer-info.c
index cffad876c..9f2394348 100644
--- a/src/plugins/xfer/xfer-info.c
+++ b/src/plugins/xfer/xfer-info.c
@@ -1,7 +1,7 @@
 /*
  * xfer-info.c - info and infolist hooks for xfer plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-info.h b/src/plugins/xfer/xfer-info.h
index d0e9e3c7c..49edaa59b 100644
--- a/src/plugins/xfer/xfer-info.h
+++ b/src/plugins/xfer/xfer-info.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-network.c b/src/plugins/xfer/xfer-network.c
index 84b6feb84..9647072f3 100644
--- a/src/plugins/xfer/xfer-network.c
+++ b/src/plugins/xfer/xfer-network.c
@@ -1,7 +1,7 @@
 /*
  * xfer-network.c - network functions for xfer plugin
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-network.h b/src/plugins/xfer/xfer-network.h
index 05acf0517..f85642124 100644
--- a/src/plugins/xfer/xfer-network.h
+++ b/src/plugins/xfer/xfer-network.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-upgrade.c b/src/plugins/xfer/xfer-upgrade.c
index f2c44c61a..3b312ef49 100644
--- a/src/plugins/xfer/xfer-upgrade.c
+++ b/src/plugins/xfer/xfer-upgrade.c
@@ -1,7 +1,7 @@
 /*
  * xfer-upgrade.c - save/restore xfer plugin data when upgrading WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer-upgrade.h b/src/plugins/xfer/xfer-upgrade.h
index 9ab386380..5b97fe8f0 100644
--- a/src/plugins/xfer/xfer-upgrade.h
+++ b/src/plugins/xfer/xfer-upgrade.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer.c b/src/plugins/xfer/xfer.c
index 717c4a7d8..f3a5dc59b 100644
--- a/src/plugins/xfer/xfer.c
+++ b/src/plugins/xfer/xfer.c
@@ -1,7 +1,7 @@
 /*
  * xfer.c - file transfer and direct chat plugin for WeeChat
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/src/plugins/xfer/xfer.h b/src/plugins/xfer/xfer.h
index 171ce0d3b..3992a55c3 100644
--- a/src/plugins/xfer/xfer.h
+++ b/src/plugins/xfer/xfer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 27d9139e6..732f19d42 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tests/scripts/python/testapi.py b/tests/scripts/python/testapi.py
index c241a5225..972ce2820 100644
--- a/tests/scripts/python/testapi.py
+++ b/tests/scripts/python/testapi.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/scripts/python/testapigen.py b/tests/scripts/python/testapigen.py
index 20f7b2b51..a98b5d967 100755
--- a/tests/scripts/python/testapigen.py
+++ b/tests/scripts/python/testapigen.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/scripts/python/unparse.py b/tests/scripts/python/unparse.py
index b327bcbdc..6f18658c4 100755
--- a/tests/scripts/python/unparse.py
+++ b/tests/scripts/python/unparse.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/scripts/test-scripts.cpp b/tests/scripts/test-scripts.cpp
index 806695e83..5140060f4 100644
--- a/tests/scripts/test-scripts.cpp
+++ b/tests/scripts/test-scripts.cpp
@@ -1,7 +1,7 @@
 /*
  * test-scripts.cpp - test scripting API
  *
- * Copyright (C) 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2017-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/tests-record.cpp b/tests/tests-record.cpp
index 423caf540..2fbeb819f 100644
--- a/tests/tests-record.cpp
+++ b/tests/tests-record.cpp
@@ -1,7 +1,7 @@
 /*
  * tests-record.cpp - record and search in messages displayed
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/tests-record.h b/tests/tests-record.h
index 52283ffb2..c915e5ed5 100644
--- a/tests/tests-record.h
+++ b/tests/tests-record.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/tests.cpp b/tests/tests.cpp
index c9d4755cd..44fbf9a79 100644
--- a/tests/tests.cpp
+++ b/tests/tests.cpp
@@ -1,7 +1,7 @@
 /*
  * tests.cpp - run WeeChat tests
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/tests.h b/tests/tests.h
index 07437030c..55f3228de 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-command-run.cpp b/tests/unit/core/hook/test-hook-command-run.cpp
index 6691b3f9f..19868e7e5 100644
--- a/tests/unit/core/hook/test-hook-command-run.cpp
+++ b/tests/unit/core/hook/test-hook-command-run.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-command-run.cpp - test hook command run functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-command.cpp b/tests/unit/core/hook/test-hook-command.cpp
index 0f1d9a8b4..1891e53b7 100644
--- a/tests/unit/core/hook/test-hook-command.cpp
+++ b/tests/unit/core/hook/test-hook-command.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-command.cpp - test hook command functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-completion.cpp b/tests/unit/core/hook/test-hook-completion.cpp
index 742042864..284575947 100644
--- a/tests/unit/core/hook/test-hook-completion.cpp
+++ b/tests/unit/core/hook/test-hook-completion.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-completion.cpp - test hook completion functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-config.cpp b/tests/unit/core/hook/test-hook-config.cpp
index 195e1a61f..e8932cf8f 100644
--- a/tests/unit/core/hook/test-hook-config.cpp
+++ b/tests/unit/core/hook/test-hook-config.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-config.cpp - test hook config functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-connect.cpp b/tests/unit/core/hook/test-hook-connect.cpp
index 3aa6b1c9e..a5f24532f 100644
--- a/tests/unit/core/hook/test-hook-connect.cpp
+++ b/tests/unit/core/hook/test-hook-connect.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-connect.cpp - test hook connect functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-fd.cpp b/tests/unit/core/hook/test-hook-fd.cpp
index 5b36459d6..3da1e7e51 100644
--- a/tests/unit/core/hook/test-hook-fd.cpp
+++ b/tests/unit/core/hook/test-hook-fd.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-fd.cpp - test hook fd functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-focus.cpp b/tests/unit/core/hook/test-hook-focus.cpp
index 4da3cb93f..a71f2a64c 100644
--- a/tests/unit/core/hook/test-hook-focus.cpp
+++ b/tests/unit/core/hook/test-hook-focus.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-focus.cpp - test hook focus functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-hdata.cpp b/tests/unit/core/hook/test-hook-hdata.cpp
index 9d8609013..963ef0e03 100644
--- a/tests/unit/core/hook/test-hook-hdata.cpp
+++ b/tests/unit/core/hook/test-hook-hdata.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-hdata.cpp - test hook hdata functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-hsignal.cpp b/tests/unit/core/hook/test-hook-hsignal.cpp
index 8bbbd5fc9..8cc2c40ca 100644
--- a/tests/unit/core/hook/test-hook-hsignal.cpp
+++ b/tests/unit/core/hook/test-hook-hsignal.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-hsignal.cpp - test hook hsignal functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-info-hashtable.cpp b/tests/unit/core/hook/test-hook-info-hashtable.cpp
index 43acc3645..112c75215 100644
--- a/tests/unit/core/hook/test-hook-info-hashtable.cpp
+++ b/tests/unit/core/hook/test-hook-info-hashtable.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-info-hashtable.cpp - test hook info hashtable functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-info.cpp b/tests/unit/core/hook/test-hook-info.cpp
index 718ffc4e1..9c8f26374 100644
--- a/tests/unit/core/hook/test-hook-info.cpp
+++ b/tests/unit/core/hook/test-hook-info.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-info.cpp - test hook info functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-infolist.cpp b/tests/unit/core/hook/test-hook-infolist.cpp
index fb7be877e..aad620629 100644
--- a/tests/unit/core/hook/test-hook-infolist.cpp
+++ b/tests/unit/core/hook/test-hook-infolist.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-infolist.cpp - test hook infolist functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-line.cpp b/tests/unit/core/hook/test-hook-line.cpp
index a290190a3..2c5701c74 100644
--- a/tests/unit/core/hook/test-hook-line.cpp
+++ b/tests/unit/core/hook/test-hook-line.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-line.cpp - test hook line functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-modifier.cpp b/tests/unit/core/hook/test-hook-modifier.cpp
index a4b84559c..198f558d4 100644
--- a/tests/unit/core/hook/test-hook-modifier.cpp
+++ b/tests/unit/core/hook/test-hook-modifier.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-modifier.cpp - test hook modifier functions
  *
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-print.cpp b/tests/unit/core/hook/test-hook-print.cpp
index f948906cf..d5db3ae67 100644
--- a/tests/unit/core/hook/test-hook-print.cpp
+++ b/tests/unit/core/hook/test-hook-print.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-print.cpp - test hook print functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-process.cpp b/tests/unit/core/hook/test-hook-process.cpp
index 41c16262b..c18ebeb36 100644
--- a/tests/unit/core/hook/test-hook-process.cpp
+++ b/tests/unit/core/hook/test-hook-process.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-process.cpp - test hook process functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-signal.cpp b/tests/unit/core/hook/test-hook-signal.cpp
index e62e88bf0..3d3379b4a 100644
--- a/tests/unit/core/hook/test-hook-signal.cpp
+++ b/tests/unit/core/hook/test-hook-signal.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-signal.cpp - test hook signal functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-timer.cpp b/tests/unit/core/hook/test-hook-timer.cpp
index eedd48ba8..e33120e45 100644
--- a/tests/unit/core/hook/test-hook-timer.cpp
+++ b/tests/unit/core/hook/test-hook-timer.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-timer.cpp - test hook timer functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/hook/test-hook-url.cpp b/tests/unit/core/hook/test-hook-url.cpp
index dcad37931..d18f58780 100644
--- a/tests/unit/core/hook/test-hook-url.cpp
+++ b/tests/unit/core/hook/test-hook-url.cpp
@@ -1,7 +1,7 @@
 /*
  * test-hook-url.cpp - test hook url functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-arraylist.cpp b/tests/unit/core/test-core-arraylist.cpp
index d77b002c1..9507d285f 100644
--- a/tests/unit/core/test-core-arraylist.cpp
+++ b/tests/unit/core/test-core-arraylist.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-arraylist.cpp - test arraylist functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-calc.cpp b/tests/unit/core/test-core-calc.cpp
index 214f27446..09fb6f549 100644
--- a/tests/unit/core/test-core-calc.cpp
+++ b/tests/unit/core/test-core-calc.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-calc.cpp - test calculations functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-command.cpp b/tests/unit/core/test-core-command.cpp
index c3aea2e20..0cc04ed4f 100644
--- a/tests/unit/core/test-core-command.cpp
+++ b/tests/unit/core/test-core-command.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-command.cpp - test command functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-config-file.cpp b/tests/unit/core/test-core-config-file.cpp
index 233e76e9b..413f64729 100644
--- a/tests/unit/core/test-core-config-file.cpp
+++ b/tests/unit/core/test-core-config-file.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-config-file.cpp - test configuration file functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-crypto.cpp b/tests/unit/core/test-core-crypto.cpp
index 64813c79f..bdc444db2 100644
--- a/tests/unit/core/test-core-crypto.cpp
+++ b/tests/unit/core/test-core-crypto.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-crypto.cpp - test cryptographic functions
  *
- * Copyright (C) 2020-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2020-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-dir.cpp b/tests/unit/core/test-core-dir.cpp
index 245e5c63b..5aca4b91d 100644
--- a/tests/unit/core/test-core-dir.cpp
+++ b/tests/unit/core/test-core-dir.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-dir.cpp - test directory/file functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-eval.cpp b/tests/unit/core/test-core-eval.cpp
index 250732173..f22e32a02 100644
--- a/tests/unit/core/test-core-eval.cpp
+++ b/tests/unit/core/test-core-eval.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-eval.cpp - test evaluation functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-hashtable.cpp b/tests/unit/core/test-core-hashtable.cpp
index 5e0cb9809..7f080f715 100644
--- a/tests/unit/core/test-core-hashtable.cpp
+++ b/tests/unit/core/test-core-hashtable.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-hashtable.cpp - test hashtable functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-hdata.cpp b/tests/unit/core/test-core-hdata.cpp
index db3b50965..7987c35a8 100644
--- a/tests/unit/core/test-core-hdata.cpp
+++ b/tests/unit/core/test-core-hdata.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-hdata.cpp - test hdata functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-hook.cpp b/tests/unit/core/test-core-hook.cpp
index 9d0337b0f..b42bed378 100644
--- a/tests/unit/core/test-core-hook.cpp
+++ b/tests/unit/core/test-core-hook.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-hook.cpp - test hook functions
  *
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-infolist.cpp b/tests/unit/core/test-core-infolist.cpp
index 166aa8e37..60b79be48 100644
--- a/tests/unit/core/test-core-infolist.cpp
+++ b/tests/unit/core/test-core-infolist.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-infolist.cpp - test infolist functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-input.cpp b/tests/unit/core/test-core-input.cpp
index 7504e47db..6ef6cee14 100644
--- a/tests/unit/core/test-core-input.cpp
+++ b/tests/unit/core/test-core-input.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-input.cpp - test input functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-list.cpp b/tests/unit/core/test-core-list.cpp
index 878a6603a..7b374d272 100644
--- a/tests/unit/core/test-core-list.cpp
+++ b/tests/unit/core/test-core-list.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-list.cpp - test list functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-network.cpp b/tests/unit/core/test-core-network.cpp
index 227086ecd..212a65467 100644
--- a/tests/unit/core/test-core-network.cpp
+++ b/tests/unit/core/test-core-network.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-network.cpp - test network functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-secure.cpp b/tests/unit/core/test-core-secure.cpp
index 5613d235e..ca00adeef 100644
--- a/tests/unit/core/test-core-secure.cpp
+++ b/tests/unit/core/test-core-secure.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-secure.cpp - test secured data functions
  *
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-signal.cpp b/tests/unit/core/test-core-signal.cpp
index 01c00c814..c1bbf18a7 100644
--- a/tests/unit/core/test-core-signal.cpp
+++ b/tests/unit/core/test-core-signal.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-signal.cpp - test util functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-string.cpp b/tests/unit/core/test-core-string.cpp
index b76930432..3138d3817 100644
--- a/tests/unit/core/test-core-string.cpp
+++ b/tests/unit/core/test-core-string.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-string.cpp - test string functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-sys.cpp b/tests/unit/core/test-core-sys.cpp
index f20d52184..51b4054d0 100644
--- a/tests/unit/core/test-core-sys.cpp
+++ b/tests/unit/core/test-core-sys.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-sys.cpp - test system functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-url.cpp b/tests/unit/core/test-core-url.cpp
index 0150bf3e5..ffe158993 100644
--- a/tests/unit/core/test-core-url.cpp
+++ b/tests/unit/core/test-core-url.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-url.cpp - test URL functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-utf8.cpp b/tests/unit/core/test-core-utf8.cpp
index 79c17546c..39e2e0992 100644
--- a/tests/unit/core/test-core-utf8.cpp
+++ b/tests/unit/core/test-core-utf8.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-utf8.cpp - test UTF-8 string functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/core/test-core-util.cpp b/tests/unit/core/test-core-util.cpp
index 149fd9e0e..94f7624ef 100644
--- a/tests/unit/core/test-core-util.cpp
+++ b/tests/unit/core/test-core-util.cpp
@@ -1,7 +1,7 @@
 /*
  * test-core-util.cpp - test util functions
  *
- * Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/curses/test-gui-curses-mouse.cpp b/tests/unit/gui/curses/test-gui-curses-mouse.cpp
index b317d6f27..1f7e67b01 100644
--- a/tests/unit/gui/curses/test-gui-curses-mouse.cpp
+++ b/tests/unit/gui/curses/test-gui-curses-mouse.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-curses-mouse.cpp - test mouse functions (Curses interface)
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-bar-item-custom.cpp b/tests/unit/gui/test-gui-bar-item-custom.cpp
index df9f41393..75dd03556 100644
--- a/tests/unit/gui/test-gui-bar-item-custom.cpp
+++ b/tests/unit/gui/test-gui-bar-item-custom.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-bar-item-custom.cpp - test custom bar item functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-bar-item.cpp b/tests/unit/gui/test-gui-bar-item.cpp
index 7e9aebcda..994b54377 100644
--- a/tests/unit/gui/test-gui-bar-item.cpp
+++ b/tests/unit/gui/test-gui-bar-item.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-bar-item.cpp - test bar item functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-bar-window.cpp b/tests/unit/gui/test-gui-bar-window.cpp
index 028790733..ea95fd0c8 100644
--- a/tests/unit/gui/test-gui-bar-window.cpp
+++ b/tests/unit/gui/test-gui-bar-window.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-bar-window.cpp - test bar window functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-bar.cpp b/tests/unit/gui/test-gui-bar.cpp
index d234617d6..12be5e389 100644
--- a/tests/unit/gui/test-gui-bar.cpp
+++ b/tests/unit/gui/test-gui-bar.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-bar.cpp - test bar functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-buffer.cpp b/tests/unit/gui/test-gui-buffer.cpp
index 06a03ecee..55eb66220 100644
--- a/tests/unit/gui/test-gui-buffer.cpp
+++ b/tests/unit/gui/test-gui-buffer.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-buffer.cpp - test buffer functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-chat.cpp b/tests/unit/gui/test-gui-chat.cpp
index 59a7eb309..368610fdf 100644
--- a/tests/unit/gui/test-gui-chat.cpp
+++ b/tests/unit/gui/test-gui-chat.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-chat.cpp - test chat functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-color.cpp b/tests/unit/gui/test-gui-color.cpp
index a3ac473dd..214db2008 100644
--- a/tests/unit/gui/test-gui-color.cpp
+++ b/tests/unit/gui/test-gui-color.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-color.cpp - test color functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-filter.cpp b/tests/unit/gui/test-gui-filter.cpp
index 9069b7a9b..4ae6611ec 100644
--- a/tests/unit/gui/test-gui-filter.cpp
+++ b/tests/unit/gui/test-gui-filter.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-filter.cpp - test filter functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-hotlist.cpp b/tests/unit/gui/test-gui-hotlist.cpp
index f0497f360..3d58dbbc8 100644
--- a/tests/unit/gui/test-gui-hotlist.cpp
+++ b/tests/unit/gui/test-gui-hotlist.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-hotlist.cpp - test hotlist functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-input.cpp b/tests/unit/gui/test-gui-input.cpp
index d61dde8ae..e8190460a 100644
--- a/tests/unit/gui/test-gui-input.cpp
+++ b/tests/unit/gui/test-gui-input.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-input.cpp - test input functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-key.cpp b/tests/unit/gui/test-gui-key.cpp
index 3f056ab38..66e512013 100644
--- a/tests/unit/gui/test-gui-key.cpp
+++ b/tests/unit/gui/test-gui-key.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-key.cpp - test key functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-line.cpp b/tests/unit/gui/test-gui-line.cpp
index c27b4cf28..5d72eba4b 100644
--- a/tests/unit/gui/test-gui-line.cpp
+++ b/tests/unit/gui/test-gui-line.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-line.cpp - test line functions
  *
- * Copyright (C) 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2018-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-nick.cpp b/tests/unit/gui/test-gui-nick.cpp
index 7cd6f0120..fd367e7b2 100644
--- a/tests/unit/gui/test-gui-nick.cpp
+++ b/tests/unit/gui/test-gui-nick.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-nick.cpp - test nick functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/gui/test-gui-nicklist.cpp b/tests/unit/gui/test-gui-nicklist.cpp
index 38324c202..cd14e2df1 100644
--- a/tests/unit/gui/test-gui-nicklist.cpp
+++ b/tests/unit/gui/test-gui-nicklist.cpp
@@ -1,7 +1,7 @@
 /*
  * test-gui-nicklist.cpp - test nicklist functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/alias/test-alias.cpp b/tests/unit/plugins/alias/test-alias.cpp
index 5dd79aa5b..b3959d3c4 100644
--- a/tests/unit/plugins/alias/test-alias.cpp
+++ b/tests/unit/plugins/alias/test-alias.cpp
@@ -1,7 +1,7 @@
 /*
  * test-alias.cpp - test alias functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-batch.cpp b/tests/unit/plugins/irc/test-irc-batch.cpp
index 83cbe3889..b43b5638e 100644
--- a/tests/unit/plugins/irc/test-irc-batch.cpp
+++ b/tests/unit/plugins/irc/test-irc-batch.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-batch.cpp - test IRC batch functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-buffer.cpp b/tests/unit/plugins/irc/test-irc-buffer.cpp
index ea62597b0..2ad9230f9 100644
--- a/tests/unit/plugins/irc/test-irc-buffer.cpp
+++ b/tests/unit/plugins/irc/test-irc-buffer.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-buffer.cpp - test IRC buffer functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-channel.cpp b/tests/unit/plugins/irc/test-irc-channel.cpp
index 45f8762ba..88c52ceb0 100644
--- a/tests/unit/plugins/irc/test-irc-channel.cpp
+++ b/tests/unit/plugins/irc/test-irc-channel.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-channel.cpp - test IRC channel functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-color.cpp b/tests/unit/plugins/irc/test-irc-color.cpp
index 46b7f93b7..9170966b4 100644
--- a/tests/unit/plugins/irc/test-irc-color.cpp
+++ b/tests/unit/plugins/irc/test-irc-color.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-color.cpp - test IRC color functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-command.cpp b/tests/unit/plugins/irc/test-irc-command.cpp
index b08b71650..5c524ceba 100644
--- a/tests/unit/plugins/irc/test-irc-command.cpp
+++ b/tests/unit/plugins/irc/test-irc-command.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-command.cpp - test IRC commands
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-config.cpp b/tests/unit/plugins/irc/test-irc-config.cpp
index 60347c0fe..50daaddfd 100644
--- a/tests/unit/plugins/irc/test-irc-config.cpp
+++ b/tests/unit/plugins/irc/test-irc-config.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-config.cpp - test IRC configuration functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-ctcp.cpp b/tests/unit/plugins/irc/test-irc-ctcp.cpp
index 6fa6e52b6..9573bb60f 100644
--- a/tests/unit/plugins/irc/test-irc-ctcp.cpp
+++ b/tests/unit/plugins/irc/test-irc-ctcp.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-ctcp.cpp - test IRC CTCP functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-ignore.cpp b/tests/unit/plugins/irc/test-irc-ignore.cpp
index 6e2ef3c26..9592bb5c1 100644
--- a/tests/unit/plugins/irc/test-irc-ignore.cpp
+++ b/tests/unit/plugins/irc/test-irc-ignore.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-ignore.cpp - test IRC ignore functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-info.cpp b/tests/unit/plugins/irc/test-irc-info.cpp
index 7b4fefa28..afa3c6c5c 100644
--- a/tests/unit/plugins/irc/test-irc-info.cpp
+++ b/tests/unit/plugins/irc/test-irc-info.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-info.cpp - test IRC info functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-join.cpp b/tests/unit/plugins/irc/test-irc-join.cpp
index f5f541b53..c5b837f2e 100644
--- a/tests/unit/plugins/irc/test-irc-join.cpp
+++ b/tests/unit/plugins/irc/test-irc-join.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-join.cpp - test IRC join functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-list.cpp b/tests/unit/plugins/irc/test-irc-list.cpp
index 8b77a0d0f..a3e27f229 100644
--- a/tests/unit/plugins/irc/test-irc-list.cpp
+++ b/tests/unit/plugins/irc/test-irc-list.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-list.cpp - test IRC list functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-message.cpp b/tests/unit/plugins/irc/test-irc-message.cpp
index 250c5a105..638f85c05 100644
--- a/tests/unit/plugins/irc/test-irc-message.cpp
+++ b/tests/unit/plugins/irc/test-irc-message.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-message.cpp - test IRC message functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-mode.cpp b/tests/unit/plugins/irc/test-irc-mode.cpp
index 471bee622..bcbdd33f6 100644
--- a/tests/unit/plugins/irc/test-irc-mode.cpp
+++ b/tests/unit/plugins/irc/test-irc-mode.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-mode.cpp - test IRC mode functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-nick.cpp b/tests/unit/plugins/irc/test-irc-nick.cpp
index 8ec2493ed..a96fe9a3d 100644
--- a/tests/unit/plugins/irc/test-irc-nick.cpp
+++ b/tests/unit/plugins/irc/test-irc-nick.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-nick.cpp - test IRC nick functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-protocol.cpp b/tests/unit/plugins/irc/test-irc-protocol.cpp
index fc5f91e01..704d60da5 100644
--- a/tests/unit/plugins/irc/test-irc-protocol.cpp
+++ b/tests/unit/plugins/irc/test-irc-protocol.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-protocol.cpp - test IRC protocol functions
  *
- * Copyright (C) 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2019-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-sasl.cpp b/tests/unit/plugins/irc/test-irc-sasl.cpp
index 4be57a6a6..b439a2147 100644
--- a/tests/unit/plugins/irc/test-irc-sasl.cpp
+++ b/tests/unit/plugins/irc/test-irc-sasl.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-sasl.cpp - test IRC SASL functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-server.cpp b/tests/unit/plugins/irc/test-irc-server.cpp
index e902a909c..66395c8e2 100644
--- a/tests/unit/plugins/irc/test-irc-server.cpp
+++ b/tests/unit/plugins/irc/test-irc-server.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-server.cpp - test IRC protocol functions
  *
- * Copyright (C) 2020-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2020-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/irc/test-irc-tag.cpp b/tests/unit/plugins/irc/test-irc-tag.cpp
index e1392dfdf..7e3b3a967 100644
--- a/tests/unit/plugins/irc/test-irc-tag.cpp
+++ b/tests/unit/plugins/irc/test-irc-tag.cpp
@@ -1,7 +1,7 @@
 /*
  * test-irc-tag.cpp - test IRC message tags functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/logger/test-logger-backlog.cpp b/tests/unit/plugins/logger/test-logger-backlog.cpp
index b5812e027..92f3e82c5 100644
--- a/tests/unit/plugins/logger/test-logger-backlog.cpp
+++ b/tests/unit/plugins/logger/test-logger-backlog.cpp
@@ -1,7 +1,7 @@
 /*
  * test-logger-backlog.cpp - test logger backlog functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/logger/test-logger-tail.cpp b/tests/unit/plugins/logger/test-logger-tail.cpp
index 9e915cf25..95f90980d 100644
--- a/tests/unit/plugins/logger/test-logger-tail.cpp
+++ b/tests/unit/plugins/logger/test-logger-tail.cpp
@@ -1,7 +1,7 @@
 /*
  * test-logger-tail.cpp - test logger tail functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/logger/test-logger.cpp b/tests/unit/plugins/logger/test-logger.cpp
index ed06d8816..16723bd53 100644
--- a/tests/unit/plugins/logger/test-logger.cpp
+++ b/tests/unit/plugins/logger/test-logger.cpp
@@ -1,7 +1,7 @@
 /*
  * test-logger.cpp - test logger functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/api/remote/test-relay-remote-event.cpp b/tests/unit/plugins/relay/api/remote/test-relay-remote-event.cpp
index 599921b88..790fc6c91 100644
--- a/tests/unit/plugins/relay/api/remote/test-relay-remote-event.cpp
+++ b/tests/unit/plugins/relay/api/remote/test-relay-remote-event.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-remote-event.cpp - test event functions for relay remote
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/api/remote/test-relay-remote-network.cpp b/tests/unit/plugins/relay/api/remote/test-relay-remote-network.cpp
index 6f05f904c..6f0652680 100644
--- a/tests/unit/plugins/relay/api/remote/test-relay-remote-network.cpp
+++ b/tests/unit/plugins/relay/api/remote/test-relay-remote-network.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-remote-network.cpp - test network functions for relay remote
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/api/test-relay-api-msg.cpp b/tests/unit/plugins/relay/api/test-relay-api-msg.cpp
index 0090252d8..abba8ba51 100644
--- a/tests/unit/plugins/relay/api/test-relay-api-msg.cpp
+++ b/tests/unit/plugins/relay/api/test-relay-api-msg.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-api-msg.cpp - test relay API protocol (messages)
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/api/test-relay-api-protocol.cpp b/tests/unit/plugins/relay/api/test-relay-api-protocol.cpp
index bef69b0ed..8d8456a55 100644
--- a/tests/unit/plugins/relay/api/test-relay-api-protocol.cpp
+++ b/tests/unit/plugins/relay/api/test-relay-api-protocol.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-api-protocol.cpp - test relay API protocol (protocol)
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/api/test-relay-api.cpp b/tests/unit/plugins/relay/api/test-relay-api.cpp
index e972aadf8..24dc0bcce 100644
--- a/tests/unit/plugins/relay/api/test-relay-api.cpp
+++ b/tests/unit/plugins/relay/api/test-relay-api.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-api.cpp - test relay API protocol (general functions)
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/irc/test-relay-irc.cpp b/tests/unit/plugins/relay/irc/test-relay-irc.cpp
index cfa6b79a7..693c0faa7 100644
--- a/tests/unit/plugins/relay/irc/test-relay-irc.cpp
+++ b/tests/unit/plugins/relay/irc/test-relay-irc.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-irc.cpp - test relay IRC protocol
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/test-relay-auth.cpp b/tests/unit/plugins/relay/test-relay-auth.cpp
index b4574e7e5..6b3f4af0e 100644
--- a/tests/unit/plugins/relay/test-relay-auth.cpp
+++ b/tests/unit/plugins/relay/test-relay-auth.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-auth.cpp - test client authentication functions
  *
- * Copyright (C) 2020-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2020-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/test-relay-bar-item.cpp b/tests/unit/plugins/relay/test-relay-bar-item.cpp
index 9b69a5e2d..7a1385c2e 100644
--- a/tests/unit/plugins/relay/test-relay-bar-item.cpp
+++ b/tests/unit/plugins/relay/test-relay-bar-item.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-bar-item.cpp - test relay bar item functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/test-relay-http.cpp b/tests/unit/plugins/relay/test-relay-http.cpp
index 4bb6cadb3..5d5f3f0da 100644
--- a/tests/unit/plugins/relay/test-relay-http.cpp
+++ b/tests/unit/plugins/relay/test-relay-http.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-http.cpp - test HTTP functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/test-relay-raw.cpp b/tests/unit/plugins/relay/test-relay-raw.cpp
index 620b85f93..308d2fa2e 100644
--- a/tests/unit/plugins/relay/test-relay-raw.cpp
+++ b/tests/unit/plugins/relay/test-relay-raw.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-raw.cpp - test raw messages functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/test-relay-remote.cpp b/tests/unit/plugins/relay/test-relay-remote.cpp
index 203b12fe5..8bc079a98 100644
--- a/tests/unit/plugins/relay/test-relay-remote.cpp
+++ b/tests/unit/plugins/relay/test-relay-remote.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-remote.cpp - test relay remote functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/relay/test-relay-websocket.cpp b/tests/unit/plugins/relay/test-relay-websocket.cpp
index 4d27d0470..dc48b79aa 100644
--- a/tests/unit/plugins/relay/test-relay-websocket.cpp
+++ b/tests/unit/plugins/relay/test-relay-websocket.cpp
@@ -1,7 +1,7 @@
 /*
  * test-relay-websocket.cpp - test websocket functions
  *
- * Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/test-plugin-api-info.cpp b/tests/unit/plugins/test-plugin-api-info.cpp
index 4293bdff3..ec1f95076 100644
--- a/tests/unit/plugins/test-plugin-api-info.cpp
+++ b/tests/unit/plugins/test-plugin-api-info.cpp
@@ -1,7 +1,7 @@
 /*
  * test-plugin-api-info.cpp - tests API info functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/test-plugin-config.cpp b/tests/unit/plugins/test-plugin-config.cpp
index 5dc8d82f1..4f25a3bca 100644
--- a/tests/unit/plugins/test-plugin-config.cpp
+++ b/tests/unit/plugins/test-plugin-config.cpp
@@ -1,7 +1,7 @@
 /*
  * test-plugin-config.cpp - tests plugins config functions
  *
- * Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/test-plugins.cpp b/tests/unit/plugins/test-plugins.cpp
index b0e67f1e8..559bd76d4 100644
--- a/tests/unit/plugins/test-plugins.cpp
+++ b/tests/unit/plugins/test-plugins.cpp
@@ -1,7 +1,7 @@
 /*
  * test-plugins.cpp - generic tests on plugins
  *
- * Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/trigger/test-trigger-config.cpp b/tests/unit/plugins/trigger/test-trigger-config.cpp
index 31977933c..76fb44899 100644
--- a/tests/unit/plugins/trigger/test-trigger-config.cpp
+++ b/tests/unit/plugins/trigger/test-trigger-config.cpp
@@ -1,7 +1,7 @@
 /*
  * test-trigger-config.cpp - test trigger configuration functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/trigger/test-trigger.cpp b/tests/unit/plugins/trigger/test-trigger.cpp
index 9e949b7b1..b19dc5390 100644
--- a/tests/unit/plugins/trigger/test-trigger.cpp
+++ b/tests/unit/plugins/trigger/test-trigger.cpp
@@ -1,7 +1,7 @@
 /*
  * test-trigger.cpp - test trigger functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/typing/test-typing-status.cpp b/tests/unit/plugins/typing/test-typing-status.cpp
index 3f48c4abd..b88a1a530 100644
--- a/tests/unit/plugins/typing/test-typing-status.cpp
+++ b/tests/unit/plugins/typing/test-typing-status.cpp
@@ -1,7 +1,7 @@
 /*
  * test-typing-status.cpp - test typing status functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/typing/test-typing.cpp b/tests/unit/plugins/typing/test-typing.cpp
index 08854b068..4ce782cbc 100644
--- a/tests/unit/plugins/typing/test-typing.cpp
+++ b/tests/unit/plugins/typing/test-typing.cpp
@@ -1,7 +1,7 @@
 /*
  * test-typing.cpp - test typing functions
  *
- * Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/xfer/test-xfer-file.cpp b/tests/unit/plugins/xfer/test-xfer-file.cpp
index 7a28a778b..7bbdb46ae 100644
--- a/tests/unit/plugins/xfer/test-xfer-file.cpp
+++ b/tests/unit/plugins/xfer/test-xfer-file.cpp
@@ -1,7 +1,7 @@
 /*
  * test-xfer-file.cpp - test xfer file functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tests/unit/plugins/xfer/test-xfer-network.cpp b/tests/unit/plugins/xfer/test-xfer-network.cpp
index a10fb872c..15501499b 100644
--- a/tests/unit/plugins/xfer/test-xfer-network.cpp
+++ b/tests/unit/plugins/xfer/test-xfer-network.cpp
@@ -1,7 +1,7 @@
 /*
  * test-xfer-network.cpp - test xfer network functions
  *
- * Copyright (C) 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
+ * SPDX-FileCopyrightText: 2022-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * This file is part of WeeChat, the extensible chat client.
  *
diff --git a/tools/build_debian.sh b/tools/build_debian.sh
index 12ae6751a..9e329c5d3 100755
--- a/tools/build_debian.sh
+++ b/tools/build_debian.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/build_test.sh b/tools/build_test.sh
index 1fd2666bf..6f4043b98 100755
--- a/tools/build_test.sh
+++ b/tools/build_test.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2014-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/bump_version.sh b/tools/bump_version.sh
index 0162cb960..f3a3550fb 100755
--- a/tools/bump_version.sh
+++ b/tools/bump_version.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/check_curl_symbols.py b/tools/check_curl_symbols.py
index db4afd6ac..663e89917 100755
--- a/tools/check_curl_symbols.py
+++ b/tools/check_curl_symbols.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tools/check_scripts.sh b/tools/check_scripts.sh
index 6c2585c5b..6ad239fe6 100755
--- a/tools/check_scripts.sh
+++ b/tools/check_scripts.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/generate_python_stub.py b/tools/generate_python_stub.py
index 2ac78e0dd..540526f83 100755
--- a/tools/generate_python_stub.py
+++ b/tools/generate_python_stub.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2019 Simmo Saan <simmo.saan@gmail.com>
-# Copyright (C) 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2019 Simmo Saan <simmo.saan@gmail.com>
+# SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tools/makedist.sh b/tools/makedist.sh
index 3d6350558..35acf0577 100755
--- a/tools/makedist.sh
+++ b/tools/makedist.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/release.sh b/tools/release.sh
index 4827c9b2e..062ff0b62 100755
--- a/tools/release.sh
+++ b/tools/release.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2023-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/set_git_version.sh b/tools/set_git_version.sh
index c7338ac17..a6eb4ed59 100755
--- a/tools/set_git_version.sh
+++ b/tools/set_git_version.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2003-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/tools/test_relay_api.sh b/tools/test_relay_api.sh
index ba9ba5090..b8c50d33e 100755
--- a/tools/test_relay_api.sh
+++ b/tools/test_relay_api.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2024-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/version.sh b/version.sh
index e22ee9bf4..0967fa513 100755
--- a/version.sh
+++ b/version.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2015-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #
diff --git a/weechat.cygport.in b/weechat.cygport.in
index 9315c68bf..8577b8b6b 100644
--- a/weechat.cygport.in
+++ b/weechat.cygport.in
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
+# SPDX-FileCopyrightText: 2013-2025 Sébastien Helleu <flashcode@flashtux.org>
 #
 # This file is part of WeeChat, the extensible chat client.
 #