Conditional access techniques for H . 264 / AVC and H . 264 / SVC compressed video

Protection of video content calls for encryption of all or part of the compressed files. For the “conditional access” application, this requires to provide a video preview that is left in the clear, while the video enhancement information is encrypted. In this paper we propose four algorithms that provide the conditional access functionality. The first three algorithms are based on the idea of generating controlled drift in such a way as to obtain the desired quality level, while the fourth algorithms employs scalable coding. All four algorithms are designed so as to provide a high degree of format compliancy with H.264. We provide experimental results on several video sequences, as well as security analysis, showing that the proposed algorithms provide an effective framework to perform conditional access, with a small rate overhead with respect to an unprotected reference video, and with a high level of security.

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