Is this really workable? consider these cases
1) open access point.
2) FON type service - does that give fon guests a different IP to the base IP?
3) Kiddy surfing on daddy's broadband connection.
4) Coffe shop / bar - WiFi Point - how many McD's will get there's closed down?
What will they actually block ?
a) My account with ABC Ltd - ok I'll just sign up with XYZ Ltd
b) My phone number - ok so I'll just cancel phone service and get a new phone number / DSL connection
c) Me being able to use the internet - fine well the connection will just go in my wifes name (fictitious or otherwise)
d) me from taking out a USB dongle subscription / war-driving to grab my movies..
good to see french politicans are equally as stoopid as our lot though probably less corrupt..