Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-01-24
2006-01-24
Smithers, Matthew (Department: 2137)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S177000, C713S152000, C713S152000, C705S051000, C705S054000, C705S055000, C705S057000, C705S059000, C380S200000, C380S201000, C380S202000, C380S203000, C380S204000
Reexamination Certificate
active
06990584
ABSTRACT:
An apparatus for restricting a copy of digital information is provided with a detecting device for detecting a first watermark, which is buried in the digital information and comprises a first signal generated on the basis of a first rule. A burying device buries a second watermark, which comprises a second signal generated on the basis of a second rule and having a structure different from that of the first signal, into the digital information if the first watermark is detected by the detecting device. A recording apparatus is provided with: an inputting device for inputting the digital information; the above mentioned copy restricting apparatus; and a recording device for recording the digital information in which the second watermark is buried by the burying device.
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Office Action in JP Patent Application 10-344075, dated May 20, 2005. *Abstract* machine translation.
Kimura Hiroyuki
Moriyama Yoshiaki
Ogino Akira
Sugaya Kazumi
Yoshiura Hiroshi
Fields Courtney D.
Hitachi LTD
Nixon & Vanderhye PC
Pioneer Corporation
Smithers Matthew
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