La GPL 3 inclus par exemple des mécanismes d'entrave au brevet logiciel (la GPL 2 aussi, mais moins efficaces).
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
[^] # Re: Malgré la BSD
Posté par psychoslave__ (site web personnel) . En réponse au journal Clang compilé par Clang compile Clang et LLVM. Évalué à 3.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
Source : http://www.gnu.org/licenses/gpl.txt