Patent ID: 8861729

Claim:
A process for distributing a modified audiovisual stream towards a receiver, said modified audiovisual stream obtained from an original audiovisual stream comprising: generating the modified audiovisual content from the original audiovisual content by extracting and replacing original data of the original stream by modified data; generating a complementary stream containing the original data extracted from the original audiovisual stream; generating on a server a marked original audiovisual stream by applying an invisible first mark on the original audiovisual stream in a watermarking process, wherein the first mark is common to all receivers and the first mark is applied to data extracted from the original audiovisual stream at at least one marking position; generating a set of marking positions according to the first mark on a server, wherein the set of marking positions represent differences between the marked original audiovisual stream and the original audiovisual stream; adding the set of marking positions to the complementary stream by inserting marking data of the marked original audiovisual stream at the marking positions in the complementary stream; transmitting the modified audiovisual stream and the complementary stream with the set of marking positions towards the receiver wherein, on the receiver, a reconstitution of the audiovisual sequence comprises: extracting the original data from the complementary stream and replacing the modified data of the modified audiovisual stream by the original data, calculating marking data based on a second mark unique to each receiver and the marking positions extracted from the complementary data, generating an invisibly marked audiovisual stream having the second mark by replacing original data from the modified audiovisual stream by the marking data at the marking positions.