ID?
Why not just ask for the tv licence number and post code of the property and done with?
On the other hand, given that most users are on DDNS, can smart tvs store trackable info (like an iPlayer cookie) for streaming services? If not, every time you try to watch The Great British Bog Off the thing is going to ask for id info ... "ERROR : no cake without a cookie" ...
All this prattling about is doing my head in.