Abstract
We propose a technique for watermarking encrypted video which has been encoded using block-based video coding techniques e.g. MPEG. By dividing 8×8 DCT coefficients of the coded video into DC and AC coefficient parts, the encrypting process is applied first but only to the DC coefficient so that the watermarking process can be applied later to the AC coefficients. Although the video signal is not entirely encrypted, in some video applications such as broadcasting services, the quality of this selectively encrypted video is considered to be sufficiently degraded. The technique enables the original copy to be kept in encrypted form with local distributors who sell watermarked encrypted copies while the original owner distributes the decryption keys. After the decrypting and decoding process, the video signal still contains the watermark inside. We describe such a scheme which applies this technique for the purpose of secure distribution of copyright data. The scheme incorporates public keys for which the RSA algorithm is assumed.
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© 1999 Springer Science+Business Media Dordrecht
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Amornraksa, T., Burgess, D.R.B., Sweeney, P. (1999). Watermarking and Secure Distribution for Encrypted Video. In: Preneel, B. (eds) Secure Information Networks. IFIP — The International Federation for Information Processing, vol 23. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-35568-9_9
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DOI: https://doi.org/10.1007/978-0-387-35568-9_9
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