Am Samstag, dem 14. Feb 2004 schrieb Stephan Uhlmann:
I have written a text and published it under the GNU FDL. Now I was asked by somebody if he can use parts of that text for his diploma thesis and if that means that it also must be licensed under the FDL.
German "Urheberrecht" allows citations, in scientific works even in larger portions (http://de.wikipedia.org/wiki/Zitate_und_Urheberrecht).
My question now is, do the rules for derivative works nevertheless apply? i.e. must his thesis in which my FDL licensed text is used also be licensed under the FDL?
AFAIK local laws overrule the licence of the author.
For the exact wording of UrhG §51 see: http://bundesrecht.juris.de/bundesrecht/urhg/__51.html
IANAL