Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2006-04-04
2006-04-04
Vu, Kim (Department: 2135)
Cryptography
Video cryptography
Video electric signal modification
C380S201000, C380S203000, C386S349000, C386S349000
Reexamination Certificate
active
07023993
ABSTRACT:
A signal reproducing apparatus for prohibiting copying or unauthorized use. The apparatus includes a copying management information decision circuit19for discriminating the state of the copying management information read out from each header of a data sector and within the TOC, a protect signal generating circuit20for generating a protect signal based on the discrimination signal and a mixing circuit24for mixing a protect signal in a vertical blanking period of an analog video signal D/A converted from digital video data reproduced from an optical disc D. The apparatus also includes a descrambling circuit31for descrambling the digital data based on the copying management information and a scrambling circuit32for descrambling the digital data. The apparatus enables prohibition of unauthorized analog copying and digital copying, inhibition of serial generational copying and prohibition of unauthorized analog and digital copying simultaneously.
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Sako Yoichiro
Yoneyama Shigeyuki
Frommer William S.
Frommer & Lawrence & Haug LLP
Simon Darren M.
Son Linh
Vu Kim
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