2007/10/25, Magnus Manske magnusmanske@googlemail.com:
Putting it back under GFDL is not the issue. Releasing GFDL content as public domain is.
True, but if we republish the new content, for which public domain is claimed, under the GFDL, there is no 'releasing GFDL content as public domain'. There are two copyright issues here: the original GFDL work and the changes from the original to the derived work. The first part is allowed to be copied under the GFDL (including derivative works), the second is allowed to be copied in any way whatsoever. Thus, copying the resulting whole under the GFDL breaks copyright of neither.