DESCRAMBLING OF MULTIPLE TELEVISION CHANNELS

摘要

Various arrangements for descrambling multiple television channels concurrently are presented. A set-top box may receive a first plurality of television channels as scrambled data packets. A previously-received locally- stored networking information table may be accessed that associates each of the multiple television channels with the same entitlement control message, as indicated by a packet identifier. An entitlement control message having the same packet identifier may be received. A smartcard may be used to decrypt the entitlement control message having the same packet identifier to obtain a first control word and a second control word. Scrambled data packets corresponding to the multiple television channels may be descrambled using the first control word and the second control word. These television channels may be stored and/or output for presentation by the set-top box.