Protection of audio or video data in a playback device
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United States of America Patent
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Aug 28, 2012
Grant Date -
Jul 10, 2008
app pub date -
Jan 8, 2007
filing date -
Jan 8, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Method and apparatus to prevent hacking of encrypted audio or video content during playback. Hackers, using a debugging attachment or other tools, can illicitly access encrypted data in memory in a playback device when the data is decrypted during playback and momentarily stored in digital form. This hacking is defeated here by methodically “poisoning” the encrypted data so that it is no longer playable by a standard decoder. The poisoning involves deliberate alteration of certain bit values. On playback, the player invokes a special secure routine that provides correction of the poisoned bit values, for successful playback.
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