Recording apparatus and recording method of electronic...

Details Recording apparatus and recording method of electronic... Recording apparatus and recording method of electronic...

2005-06-21

2005-06-21

Sheikh, Ayaz (Department: 2136)

Cryptography

Video cryptography

Copy protection or prevention

C382S100000, C382S232000, C713S176000, C705S057000, C705S058000, C705S059000

Reexamination Certificate

active

06909784

ABSTRACT:
A detector (1) of signal detects an electronic watermark (first electronic watermark) signal from an inputted contents data. The detected electronic watermark signal is temporarily stored in a memory (2) for electronic watermark contents. The temporary stored electronic watermark signal is transmitted to an inserter (4) of electronic watermark signal. In the inserter (4), an electronic watermark (second electronic watermark) signal of which content is equivalent to the detected electronic watermark (first electronic watermark) signal is additionally recorded in a contents signal, which is extracted by a extractor (3) of contents signal.

REFERENCES:
patent: 6449378 (2002-09-01), Yoshida et al.
patent: 6453053 (2002-09-01), Wakasu
patent: 6510233 (2003-01-01), Nakano
patent: 6678389 (2004-01-01), Sun et al.
patent: 2000013765 (2000-01-01), None
Owaga et al., “A Copyright Information Embedding Method Using DCT for Digital Movies,” (Thesis SCIS'97-31G published in Japan on Jan. 29, 1997—English translation Abstract provided).
Ohnishi et al., “A Watermarking Scheme to Image Data by PN Sequence,” (Thesis SCIS'97-26B published in Japan on Jan. 29, 1997—English translation Abstract provided).

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