From what I heard French are obliged to surrender encryption keys at the request of authorities or go to jail for a few years for denying their request. The only thing that may be left is to pack your things and go.
However, I the twist seems to be in the word "susceptible": any encryption key is susceptible to be somehow used to commit a crime, while on the other hand a jury would probably "deny a request" of the authorities if they can't show enough evidences.