Video slice and active region based multiple partial encryption

摘要

A selective encryption decoder for decrypting and decoding a selectively encrypted digital video signal has a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted. Certain of the encrypted packets carry data representing an active region of a video frame. The unencrypted packets have a first packet identifier (PID) and the encrypted packets have a second packet identifier (PID). A decrypter receives the encrypted packets having the second PID and decrypts the encrypted packets using a first encryption method to produce decrypted packets. A PID remapper changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID. A decoder decodes the unencrypted and decrypted packets to produce a decoded video signal. This abstract is not to be considered limiting since other embodiments can include more, fewer or different features than those described in this abstract.