This paper aims at protecting copyrights in multicast communication. Multicast communication can be provided either at the network layer (example is the TP Multicast) or at the application layer (also called overlay multicast). This work focuses on overlay multicast. A main feature of overlay multicast is that end systems (rather than network routers) take over the responsibilities of delivering the multicast data from the sources to the receivers. In this paper, we present a new copyright protection scheme using watermarking to identify the multicast receivers who are leaking information. Main objectives the proposed scheme achieves are applicability in overlay multicast, suitability for multimedia as well as other applications, resistance to collusion attack, and resistance to copy attack.
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