citating FDL texts

[Stephan Uhlmann]

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Hello,

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?

Thank you for any hints,

Stephan
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