[baddox]

I remember hooking my first DVD player (I had just received for my birthday) to the family TV via an RF modulator, because the DVD player only output RCA and the TV only had a coaxial input. I tried playing The Matrix (the only DVD I had at the time), and the video constantly faded to black and back to normal every few seconds. In retrospect, I gather that was some sort of DRM implemented in the RF modulator, but I don't know if it has anything to do with what you're talking about.