This post is long overdue. Quite a few people have asked me while all of the software I create does not have the “or (at your option) any later version” that the FSF seems to suggest. (I am not against contributing to projects that do have that clause, however.) This post will explain my reasoning, and hopefully cause others to see the potential problems with it. I am absolutely not against people using this clause in general; I merely want them to be fully aware of what they’re getting into before doing so. Also, please note that this applies to any license where an “any later version” clause is used, including the GFDL. I’m not just talking about software.
Please note that I am not a lawyer and this is not legal advice.
Continue reading Why I Don’t Use GPL-style “or any later version”