"The Debian community has decided that the GNU Free
Documentation License is not actually a free license at all, and is
starting work to remove GFDL-licensed work from its main
distribution. Such will only be available in non-free, which some
people never install out of principle and CDROM vendors cannot
distribute in whole because the licenses on some packages forbid
it. Their objections stem from restrictions on modification of
invariant sections and cover texts, and are neatly summarized in
Why You Shouldn't Use the GNU FDL.
"I wrote some GFDLed publications. I am considering changing
their license, as I would like my documents to be included with
Free Software distributions, including Debian. My question is,
which one should I use? Should I change my license at all? I'm not
actually convinced that my own desire for how my work is to be used
actually meets Debian's requirements.
"I have several documents under the GFDL, specifically the
articles at the Linux Quality Database and The ZooLib Cookbook. I
have quite a few proprietary writings, and have been considering
relicensing some of them to make them Free..."