The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 2006
Filed:
Aug. 29, 2001
Koji Arimura, Fukuoka-ken, JP;
Hisashi Inoue, Fukuoka, JP;
Kenichi Noridomi, Fukuoka, JP;
Takashi Katsura, Fukuoka, JP;
Shinya Kadono, Nishinomiya, JP;
Kazuhiko Nakamura, Hirakata, JP;
Koji Arimura, Fukuoka-ken, JP;
Hisashi Inoue, Fukuoka, JP;
Kenichi Noridomi, Fukuoka, JP;
Takashi Katsura, Fukuoka, JP;
Shinya Kadono, Nishinomiya, JP;
Kazuhiko Nakamura, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A reproduction equipment converts an identification code of the reproduction equipment into a plurality of signal sequences using a correspondence table and embeds the obtained plurality of signal sequences in AV signals as a digital watermark. A reproduction equipment specifying equipment compares correlation values of the AV signals, containing the digital watermark embedded therein with all signal sequences contained in a correspondence table. A comparison of the correlation values with a previously set threshold value determines the embedded signal sequences and the identification code of the reproduction equipment which may be extracted.