Efficient Watermarking Scheme for Traitor Tracing Encryption Schemes

In the content distribution services, traitor tracing encryption schemes are useful tools to trace illegal users that distribute content illegally to unauthorized users. However, solo use of these schemes does not necessarily work well and has vulnerability. To complement the property of the traitor tracing schemes, it is effective to use watermarking scheme with them and the watermarking schemes with light load are required. A number of video watermarking methods with light load have been proposed that embed information into compressed video streams. When the compression scheme is MPEG2-Video, its codes are mostly pre-defined using coding tables, and therefore, information can be embedded in the compressed stream by substituting some of the codes. On the other hand, HEVC/H.265 uses arithmetic coding (CABAC) and it is not easy to substitute one code for another in a stream. To deal with this problem, a watermarking scheme for HEVC/H.265 video streams is proposed. It embeds information while the video is being encoded. A broadcasting system incorporating the scheme is also proposed.

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