Syntaxis writes "There's some considerable argy-bargy in progress over whether or not GNU's own GFDL is a Free documentation license at all. At issue are "invariant sections" which cannot be removed from derivative works. Check out the thread culminating in the proposed motion to take action. The current consensus on Debian-legal does indeed appear to be that one of the FSF's own licenses is non-Free under the terms of the Debian Free Software Guidelines! Well, documentation for GPLed projects countermanding the very freedoms embodied in the GPL certainly seems insane to me."