I still love how years ago, Stallman basically added a backdoor to GNU FDL just for wikipedia (and similar wikis) just for the few months when Wikipedia was migrating the license.
It worked though
to elaborate… wikipedia used to be GNU Free Document License, which is a terrible license. But there was no way to easily migrate to CC, as you would need to contact all the authors and get agreement.
So FSF used the “or later” clause to make a new version of FDL that said “these few months, wikis can migrate from this license to CC”. The new version of the license was made just for wikipedia, just so they could migrate to CC.
It worked though
to elaborate… wikipedia used to be GNU Free Document License, which is a terrible license. But there was no way to easily migrate to CC, as you would need to contact all the authors and get agreement.
So FSF used the “or later” clause to make a new version of FDL that said “these few months, wikis can migrate from this license to CC”. The new version of the license was made just for wikipedia, just so they could migrate to CC.
Here, part “relicensing”
https://www.gnu.org/licenses/fdl-1.3.html
edit also see
https://www.gnu.org/licenses/fdl-1.3-faq.html