I (Jens Ferner) have written an Email to the fsf - with two questions about the php-nuke commercial licence. The FSF said that the ©-Output can be removed and that the Commercial Licence is violating the GPL. Original Emails (also for Download) here:
http://www.phpnuke.de/article146.html. Please Notice, that every Email between FSF and users get an id, so there is no way to say that i am just kidding or this is a fake.
WarpSpeed