Patent ID: 8270598

Claim:
A method of processing audiovisual sequences according to an original stream format having a succession of frames, comprising: analyzing the succession of frames of the original stream, using an analysis module, to generate a modified main stream and complementary information, wherein said analyzing comprises: generating one or more sequences of pseudorandom values with known parameters, extracting original data from the original stream and replacing extracted original data with replacement data as a function of the values of the one or more sequences of pseudorandom values, to produce a modified main stream, and storing in the complementary information data associated with at least one of the sequences of pseudorandom values and at least some of the extracted original data; separately forwarding the modified main stream and the complementary information to equipment at an addressee; and synthesizing a stream in the original format, using a synthesis module at the addressee, as a function of the modified main stream and the complementary information.