Found this paper on the topic: http://www.law.nagoya-u.ac.jp/ls/review/_userdata/10-04.pdf But honestly I don't understand too much of it.
Either way if France joins Taiwan, that sure isn't a good thing for people relying on the GPL, but it won't break its back either. Some "industry of opportunity" may spring up (it definitely has in Taiwan), but it's not the end of the world.