I am actually speaking of Cinavia, or whatever it's called. If you stream a movie from your PC that is tied to Sony, it has code built into the soundtrack that the PS3 (and certain co-operating BR players) picks up. It lets you watch for about 10 minutes or so, then it informs you that you did not pay for the movie and it turns off the sound or kills the play altogether.

With great power comes Awesome irresponsibility.