METHOD AND SYSTEM FOR ENHANCING CONTENT SECURITY

摘要

There is provided a method and system for enhancing content security including a content corruptor module having an input for encoded content, a content parameter modifier coupled to the input and having outputs for modified content and fixer data, a content encoder coupled to the output for modified content and having an output for encoded modified content and a fixer data encoder coupled to the output for fixer data and having an output for encoded fixer data. The modified encoded content discourages copying as it is not usable with the corrector data. Modification can be made to a number of different parameters, for example DCT parameters, reversible wavelet coefficients, block order, motion vectors may be modified by the corruptor in a way that can be reversed in the pixel domain after motion compensation, such as reversing the frame and vectors, or offsetting them, or scaling. Quantization matrices could be altered so that the pixel data needs to be scaled. Reversible wavelet coefficients may be modified in a manner similar to DCT. Block order could also be altered so that blocks and their intra-block prediction need to be swapped