H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/32 (2006.01) G06T 1/00 (2006.01) H04N 5/91 (2006.01) H04N 5/913 (2006.01)
Patent
CA 2291549
An apparatus for restricting a copy of digital information (20) is provided with: a detecting device (21, 22, 23, 24) 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; and a burying device (25, 26, 27) for burying 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 (100) is provided with: an inputting device (10) for inputting the digital information; the above mentioned copy restricting apparatus (20); and a recording device (50) for recording the digital information in which the second watermark is buried by said burying device.
Kimura Hiroyuki
Moriyama Yoshiaki
Ogino Akira
Sugaya Kazumi
Yoshiura Hiroshi
Hitachi Ltd.
Macrae & Co.
Pioneer Corporation
Sony Corporation
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