Patent ID: 8584255

Claim:
A digital video signal receiver, comprising: a tuner for receiving a scrambled digital video signal; an interface for outputting said scrambled digital video signal to a conditional access subunit attachable to said receiver and for inputting a local scrambled digital video signal from said conditional access subunit; a local descrambler for descrambling said locally scrambled digital video signal received from said conditional access subunit; and a demultiplexer for receiving and demultiplexing said local descrambled digital video signal, wherein, in response to a CA command, the conditional access subunit issues a response and a status, wherein the status indicates descrambling is not possible because of no entitlement, wherein the CA command includes operands for specifying the number of elementary PID (Packet Identifier) definitions to follow, and for identifying a type of service element carried within packets with the PID whose value is specified by the elementary PID.