還有剛才查到 GPL 跟 GFDL 不相容。
http://en.wikipedia.org/wiki/GFDL#GPL_incompatible_in_both_directions
GPL incompatible in both directions
The GNU FDL is incompatible in both directions with the GPL:
that is GNU FDL material cannot be put into GPL code and GPL
code cannot be put into a GNU FDL manual. Because of this,
code samples are often dual-licensed so that they may appear
in documentation and can be incorporated into a free software program.
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