In a packet-based multiplexed communications system, a method of providing different sets of conditional access information to a remote location comprises the steps of: (a) for each different set of conditional access information, inserting the set of conditional access information into a respective...http://www.google.de/patents/US5420866?utm_source=gb-gplus-sharePatent US5420866 - Methods for providing conditional access information to decoders in a packet-based multiplexed communications system
