Patent ID: 8027470

Claim:
A selective encryption decoder, for decrypting and decoding a selectively encrypted digital video signal, comprising: a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data representing an active region of a video frame; the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID); a decrypter receiving the encrypted packets having the second PID and decrypting the encrypted packets using a first encryption method to produce decrypted packets; a PID remapper that changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and a decoder that decodes the unencrypted and decrypted packets to produce a decoded video signal.