Star pattern partial encryption

Details Star pattern partial encryption Star pattern partial encryption

H - Electricity

04

N

H04N 21/4405 (2011.01) H04N 5/44 (2011.01)

Patent

CA 2746782

A selective encryption encoder consistent with certain embodiments of the invention has a packet identifier that identifies packets of a specified packet type, the specified packet type being defined by packets occurring in a star pattern approximately situated at an upper center of an image which contain intra- coded macroblocks. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. The packets are sent to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method.

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