System and method for preventing an illegal copy of contents
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United States of America Patent
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Aug 22, 2006
Issued Date -
N/A
app pub date -
Feb 22, 2001
filing date -
Feb 24, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The method of preventing illegal copy of contents encrypts a header using a key generated from the previous sector, performs variable-length coding to the encrypted header to shorten its length, and stores the decoded header into the recording medium as well as contents data, in encryption phase. The method, in decryption phase, reproduces the contents data which have different length for each sector by decoding and encoding the header.
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