[TASK] Use default GPLv2 LICENSE.txt file

Our LICENSE.txt files contain a custom header
mentioning details of a 3rd party library.

The patch resets LICENSE.txt files to the
default GPLv2 version [1] and moves the 3rd party
credits to the backend about module, which
already lists other credits. This obeys the
authors whish to set a link to his work.

The default LICENSE.txt files have the additional
advantage that services like github should
recognize the project as GPLv2 licensed project.

[1] https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

Resolves: #96837
Releases: main, 11.5, 10.4
Change-Id: I63a4cd286ea3714667688d12347034b9ae67f276
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73432
Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/adminpanel/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/backend/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/backend/Resources/Private/Partials/About/ExternalLibraries.html

@@ -148,5 +148,9 @@ <h2 class="h3">
             <td>Muuri</td>
             <td><a href="https://haltu.github.io/muuri/" target="_blank" rel="noreferrer">haltu.github.io</a></td>
         </tr>
+        <tr>
+            <td>FAMFAMFAM Silk Icons</td>
+            <td><a href="http://famfamfam.com/lab/icons/silk/" target="_blank" rel="noreferrer">famfamfam.com</a></td>
+        </tr>
     </table>
 </div>

typo3/sysext/belog/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/beuser/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/core/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/dashboard/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/extbase/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/extensionmanager/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/felogin/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/filelist/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/filemetadata/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/fluid/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/fluid_styled_content/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/form/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/frontend/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/impexp/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/indexed_search/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/info/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/install/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/linkvalidator/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/lowlevel/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/opendocs/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/recordlist/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/recycler/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/redirects/LICENSE.txt

@@ -1,7 +1,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc., <http://fsf.org/>
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
@@ -290,8 +290,8 @@ to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
-    {description}
-    Copyright (C) {year}  {fullname}
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
 
     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
@@ -329,7 +329,7 @@ necessary.  Here is a sample; alter the names:
   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
   `Gnomovision' (which makes passes at compilers) written by James Hacker.
 
-  {signature of Ty Coon}, 1 April 1989
+  <signature of Ty Coon>, 1 April 1989
   Ty Coon, President of Vice
 
 This General Public License does not permit incorporating your program into

typo3/sysext/reports/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/rte_ckeditor/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/scheduler/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/seo/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/setup/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/sys_note/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/t3editor/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/tstemplate/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/viewpage/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 

typo3/sysext/workspaces/LICENSE.txt

@@ -1,9 +1,3 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991