Selective encryption to enable multiple decryption keys
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United States of America Patent
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Jun 19, 2007
Grant Date -
Aug 21, 2003
app pub date -
Dec 13, 2002
filing date -
Jan 2, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A selective encryption method and apparatus consistent with the invention duplicates selected packets in a file or data stream and multiple encrypts the packets using multiple encryption keys. Each encryption key is valid for a specific segment of time so that changes in entitlement keys used for decryption can be made without negatively impacting a customer's ability to access content that has been paid for.
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