Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2011-08-30
2011-08-30
Abrishamkar, Kaveh (Department: 2431)
Cryptography
Video cryptography
Copy protection or prevention
C380S044000, C380S203000, C713S165000, C713S176000, C713S193000, C369S047120, C369S047130, C369S053210, C369S275300
Reexamination Certificate
active
08009832
ABSTRACT:
The present invention relates to a method of managing CPI (Copy Protection Information) for preventing unauthorized copy of encrypted content recorded on a high-density recording medium such as a BD-ROM (Blu-ray Disc ROM). In the present method, when main content data is recorded in encrypted manner, CPI that is necessary to decrypt the encrypted main content data is written in a predetermined PIC area and is also copied at least once in an area other than the PIC area.
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Kim Jin Yong
Suh Sang Woon
Abrishamkar Kaveh
Harness & Dickey & Pierce P.L.C.
LG Electronics Inc.
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