Importance

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Abstract

Content is provided on a medium or is transmitted, for example streamed, with in-built protection against unauthorised playback or copying. Video content data is provided in content blocks, each of which relates to a video frame and has a corresponding header. Some content clocks have an excess data item, such as a digital fingerprint, interposed somewhere in the data comprising that content block. Thus, the amount of the data in the content block is increased by the addition of the digital fingerprint. Information identifying the length of the content block in the corresponding header is not altered. Some or all content blocks are obfuscated following the additional of the digital fingerprints. In a media player, de-obfuscation is performed, and digital fingerprints then removed before the resulting content blocks are decoded. Without de-obfuscation and removal of the digital fingerprints, correct decoding would not occur. Thus, playback of the content is limited to a media player that knows the de-obfuscation scheme used and knows the locations of the digital fingerprints.

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First Claim