FIELD: physics, computer engineering.
SUBSTANCE: invention relates to a device and method for secure transmission to various personal user devices of recorded copies of a multicast audiovisual program and legal use of the recoded audiovisual program being guaranteed by an innovative approach using data scrambling and marking techniques. The technical result is achieved by an apparatus and a method which includes the following steps: calculating a first mark as a function of a unique identifier of a receiving user device or an external secure device; calculating on said receiving user device a first marked audiovisual stream from said secure stream as a function of said first mark and the said complementary stream; transmitting said secure stream from said receiving device to a second device; calculating a second mark as a function of a unique identifier of a second device, an external secure device or a user using said second device; calculating on the said second user device a second marked audiovisual stream from said secure stream received from said receiving device as a function of the second mark.
EFFECT: providing identification of hacking attempts by marking content with a unique mark for each consumer device.
15 cl, 8 dwg
