The US's Federal Communications Commission has decided to allow providers to encrypt basic cable. This will undoubtedly happen and will mean some kind of cable box / cable card will be required to use cable.
http://arstechnica.com/tech-policy/...now-encrypt-tv-signals-to-halt-service-theft/
http://arstechnica.com/tech-policy/...now-encrypt-tv-signals-to-halt-service-theft/