This reply may be a little late but yes it is required for ALL HDTV CATV set top boxes to have 1394. Satellite is exempted for whatever reason I do not know. Standard def boxes for CATV are exempted as well. Ethernet was not approved at the time of the FCC ruling for DRM and is only approved now if it supports DTCP-IP with a 7ms roundtrip time (Not currently achievable). 1394 has been approved for DRM for years. The idea was HDMI for local point-to-point connectivity and...