Y. Takahashi, T. Aoki, and H. Yasuda (Japan)
fingerprinting watermarking CoFIP copyrightcontent distribution
In this paper we propose a new concept and a new scheme for Content Fingerprinting. It makes it possible to distinguish multicast audiovisual data one by one with different, unique watermarks. This means every user gets another watermarked content for multicast content distribution. Basic principle of our new scheme is as follows. Multimedia content is divided into several objects in the frequency domain. Then each object is copied and watermarked with different unique watermarks. The slightly different copies are encrypted with different encryption keys. The encrypted copies are sent to all receivers using multicast connection. Each receiver can access to the key of only one of the encrypted copies for one object. Therefore the server can control the receiver's content by selecting the pattern of keys. As a result, the fingerprint of the content consists of the total watermarks of the each object. Furthermore we evaluate the optimal number of objects to minimize the transmission data and the robustness of our fingerprint against the users’ collusive attack.
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