Abstract: A method of operation of an audio/video content receiver having a content decoder capable of decoding an audio/video program from a packetized data stream by using data packets defining decryption information comprises the steps of: receiving encoded audio/video content as a packetized data stream comprising one or more programs having data packets identified by respective sets of one or more packet identifiers and comprising identification data mapping programs to respective sets of the packet identifiers; selecting data packets from the packetized data stream for a required program according to the set of packet identifiers defined by the identification data for that stream in respect of the required program; selecting further data packets from the packetized data stream from which a program is selected which have packet identifiers not included in the identification data for that packetized data stream; generating a composite packetized data stream from the selected packets; generating composite stream ide

Abstract: An audio/video content receiver decoding audio/video signals modulated onto transmission channels as transport streams, at least one transmission channel carrying non-viewing information. The content receiver includes a tuner arrangement for concurrently tuning to two or more transmission channels and a multiplexer configured to generate a composite signal from received audio/video signals of required programs for decoding. The content receiver further includes a content decoder for concurrently decoding two or more audio/video programs from the composite signal and a detector configured to detect whether one or more of the transmission channels tuned by the tuner arrangement are not currently in use for providing a program for decoding. Finally, the content receiver includes a controller that, responsive to detection that a transmission channel is not currently in use, controls the tuner to tune that channel to a transmission channel carrying a transport stream including non-viewing information.

Abstract: An audio/video content receiver decoding audio/video signals modulated onto transmission channels as transport streams, at least one transmission channel carrying non-viewing information includes: a tuner arrangement capable of concurrently tuning to two or more transmission channels; a multiplexer configured to generate a composite signal from received audio/video signals of required programs for decoding; a content decoder capable of concurrently decoding two or more audio/video programs from the composite signal; a detector configured to detect whether one or more of the transmission channels tuned by the tuner arrangement are not currently in use for providing a program for decoding; a controller, responsive to detection that a transmission channel is not currently in use, controlling the tuner to tune that channel to a transmission channel carrying a transport stream including non-viewing information; and a non-viewing information decoder decoding the received non-viewing information.

Abstract: A method of operation of an audio/video content receiver having a content decoder capable of decoding an audio/video programme from a packetized data stream by using data packets defining decryption information comprises the steps of: receiving encoded audio/video content as a packetized data stream comprising one or more programmes having data packets identified by respective sets of one or more packet identifiers and comprising identification data mapping programmes to respective sets of the packet identifiers; selecting data packets from the packetized data stream for a required programme according to the set of packet identifiers defined by the identification data for that stream in respect of the required programme; selecting further data packets from the packetized data stream from which a programme is selected which have packet identifiers not included in the identification data for that packetized data stream; generating a composite packetized data stream from the selected packets; generating composit