1. They are incompatible, which is really silly. Ironically, CC-BY-SA 3.0 is (via an upgrade to 4.0) compatible with the GPLv3 whereas the GFDL is not. The FSF should really do something about the latter. I myself stumbled upon this problem yesterday when I wanted to take formulations from the Trisquel wiki and put them into a little GPLv3+ program.

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