Here, I leave you a URL with an excellent article on:

The free licenses by Thomas Huriez

Author: Thomas Huriez

License: Free

Publication: authorized

Copyright (c) thomas huriez
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
Free Documentation License".



Source: http://librapport.org/

http://librapport.org/Rapport-de-Stage-Les-licences-libres_13_document.html_13_document.html




Greetings from Albalat J.A.