Copy protection apparatus and information recording medium used in this copy protection apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 9, 2001
Grant Date -
N/A
app pub date -
Nov 19, 1998
filing date -
Nov 20, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention protects the unauthorized copy of multimedia data, recorded on an information recording medium, by using electronic watermark information and key information. The electronic watermark information embedded in the multimedia data is extracted by an electronic watermark extraction unit on the decryption system side. A disk key is obtained using the electronic watermark information and a part master key. The multimedia data is decrypted using the resultant disk key.
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