Patent ID: 8165292

Claim:
A method for secure distribution of an original audiovisual stream having a set of transport packets encapsulated according to a plurality of transport protocols suitable to be transmitted to a receiving device compatible with one of the transport protocols comprising: generating a protected audiovisual stream from the original stream by modifying at least one of the original transport packets comprising: an analysis step that generates a list of transport protocols containing the plurality of the transport protocols, the list being ordered in ascending order of a hierarchy of the transport protocols that encapsulate the original stream; a modification step that generates modified transport packets different from the corresponding original transport packets at modification positions and generates complementary packets comprising modification positions generated relative to the first transport protocol of the list; and an updating step that generates updated complementary packets comprising modification positions relative to the transport protocols of the list; generating a complementary stream comprising digital information suitable to allow reconstruction of the original audiovisual stream from the protected stream; and reconstituting on the receiving device the original audiovisual stream from the protected stream as a function of the complementary stream, wherein the protected audiovisual stream comprises a set of modified transport packets that are different from corresponding original transport packets at modification positions, the modification positions are in the complementary stream, and the modification positions are generated according to each transport protocol of the plurality of transport protocols of the original stream.