A scheme for conditional access-based systems using index locations of DCT coefficients

Abstract

Most of the existing conditional access-based systems (CAS) follow a standard methodology. The service provider shares two copies for single information (specifically image for this work). One copy is a low-resolution version which is shared in the public domain for preview purpose. The other one is a high-resolution version to be provided to the customers… (More)
DOI: 10.1007/s11554-014-0409-y

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