The gist of the law ([0]) is that, unless you only use crypto techniques for authentication and checksumming, you have to document the process and provide the source code to be able to import it.
That's... interesting. I'm French and I had never really heard of that law applied.
[0] http://www.legifrance.gouv.fr/affichTexte.do?cidTexte=LEGITE... (in French, obviously)
