"block the TVs access to the Internet on the router"
Not the answer unfortunately!
2. Take South America. Telmex / Claro dominates (Carlos Slim's billionaire empire). Users get locked out of their router on two levels. A. The router is locked with a password that even the call-out techs don't know. B. A blocker is placed over the cable to stop users connecting their own router or inserting their own along the chain. C. Claro use WEP encryption!!!
2. How many Friends, Family, Colleagues actually know how to do this, never mind those who actually will take the time to do it...