license: change license to LPPL

README.md

@@ -144,15 +144,14 @@ by default, even though you specified `slidelogo=fac`.
 
 ## License
 
-Copyright 2021 by Thomas Lambert <t.lambert@uliege.be>.
+Copyright 2022 by Thomas Lambert <t.lambert@uliege.be>.
 
 **Author and maintainer**: Thomas Lambert.
 
-All these packages are licensed under the [Creative Commons
-Attribution-ShareAlike 4.0 International
-License](https://creativecommons.org/licenses/by-sa/4.0/), which is essentially
-a _free software_ license. Do not hesitate to copy and modify the code to fit
-your needs.
+All these packages are licensed under the [LaTeX Project Public License
+(LPPL)][lppl].
 
 If you encounter some issues or have ideas/feature requests, do not hesitate to
 contact me or use the issue tracker.
+
+[lppl]: https://www.latex-project.org/lppl/

ULiege-colors.sty

@@ -19,10 +19,12 @@
 %% - All color names are prefixed with 'ulg' so the default colors are not
 %% overwritten.
 %%
-%%
-%% License CC-BY-SA 4.0
-%% This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
-%% International License (https://creativecommons.org/licenses/by-sa/4.0/)
+%% LaTeX Project Public License v1.3+
+%% This work may be distributed and/or modified under the conditions of the
+%% LaTeX Project Public License, either version 1.3 of this license or (at your
+%% option) any later version.
+%% http://www.latex-project.org/lppl.txt
+%% This work has the LPPL maintenance status `maintained'.
 %% =============================================================================
 
 

ULiege-trigon.sty

@@ -13,9 +13,12 @@
 %% - This package requires ULiege-colors to be present in the latex path.
 %% - This package does not conflict with any of the various trigon options.
 %%
-%% License CC-BY-SA 4.0
-%% This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
-%% International License (https://creativecommons.org/licenses/by-sa/4.0/)
+%% LaTeX Project Public License v1.3+
+%% This work may be distributed and/or modified under the conditions of the
+%% LaTeX Project Public License, either version 1.3 of this license or (at your
+%% option) any later version.
+%% http://www.latex-project.org/lppl.txt
+%% This work has the LPPL maintenance status `maintained'.
 %% =============================================================================
 
 \NeedsTeXFormat{LaTeX2e}