Patent ID: 7773752

Claim:
A digital broadcast video receiving circuit comprising: a plurality of decoder circuits configured to decode an encoded digital broadcast video signal according to respective plurality of encoding formats to provide a digital data packet based on the encoded digital broadcast video signal; an encoding circuit, coupled to the plurality of decoder circuits, configured to encode the digital data packet to provide a re-encoded digital data packet; and a secret-key process circuit, coupled to the plurality of decoder circuits, configured to store/retrieve secret keys associated with the plurality of decoder circuits and the encoding circuit, wherein the encoding circuit uses a secret key retrieved from the secret-key process circuit to encode the digital data packet and store the re-encoded digital data packet in a storage device, and wherein the secret-key process circuit comprises: an index generation circuit, coupled to the plurality of decoder circuits, configured to receive a packet identifier associated with one of the plurality of decoder circuits and configured to provide a key index therefrom; a codeword table interface circuit, coupled to the index generation circuit, configured to provide a key request based on the key index; and a codeword table circuit, coupled to the codeword table interface circuit, configured to provide secret-keys to an enabled one of the plurality of decoder circuits responsive to the key request.