See http://www.wikipedia.org/wiki/Wikipedia:Coopyrights
Section "Fair Use"
As I understand it, we don't guarantee that the images and sounds are covered by GNU/FDL, only the text. (But between a free and a non-free image or sound, the free one must be prefered).
AstroNomer
P.S. I noticed also there the frase "Wikipedia also uses text under the fair use doctrine. However, what is fair for us to use may not be fair for your intended use of the text. " That troubles me a bit.
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