I want to purchase a Premiere 4 for use with an unencrypted cable system. The system requires no CableCard. It offers much HDTV so that I feel forced to assume that it is digital. The channels are clearly cable not OTA. I believe there may be versions that function with OTA and there are definitely versions that function with a CableCard. Is there a cable version of Premiere 4 that functions with unencrypted cable, i.e. without a CableCard?