Though OT just thought I had to react to this one. There's indeed no law 'prohibiting photographing anyone anywhere without a permission' in France, that's pure fantasy....
New Jersey is considering a law banning the photographing (not just publishing) of minors without parental consent. This is similar to the crazy French law prohibiting photographing anyone anywhere with out permission. But unless this law passes, you don't have to worry.
...
Now some people in the streets might come up with such BS to prevent you from taking pics, but there's no legal basis to this in french laws.