A trap can be used to prevent an internet-only customer from receiving CATV signals (one of the things that led to the infamous Get A Cable Modem......Go To Jail »www.geocities.com/flutocracy/cablemodem.htm scenario was that either Comcast or @Home neglected to install a trap on the customer's line). If the question is whether the technology exists to prevent an internet-only customer from receiving clean CATV signal, the answer is Yes.
