Patent ID: 7240113
Filing Date: 2007-07-03
Classification: H04N

Abstract:
1. A conditional access subunit for connection to an IEEE 1394 network having a tuner subunit, the conditional access subunit having means for periodically contacting the tuner subunit to request the received transport stream for a period of time sufficient to allow the conditional access subunit to update the entitlement management messages stored in the conditional access subunit; wherein said conditional access subunit includes receiving means to receive AV/C Conditional Access Commands over the IEEE 1394 network from one or more other subunits; wherein the AV/C Conditional Access Commands include a CA enable command; wherein the CA enable command includes an operand for specifying the number of elementary PID definitions to follow, together with operands including elementary PID definitions; and wherein each of the elementary PID definitions include a stream type operand for identifying the type of service element carried within the packets with the PID whose value is specified by the elementary PID and elementary PID operands for specifying the PID of the transport stream packets that carry the associated service element.