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:
Jun. 13, 2006
Filed:
Mar. 07, 2002
Jun Hirai, Tokyo, JP;
Takashi Kohashi, Tokyo, JP;
Jun Hirai, Tokyo, JP;
Takashi Kohashi, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A copy control technique using digital watermark information, which makes it possible to prevent a content from being erroneously subjected to a copy control process according to wrong copy control information at a content-to-content transition. Copy control information in the form of digital watermark information (WM) is embedded in a content to control copying of the content in accordance with the embedded copy control information. A content-to-content transition is detected by detecting a change in a content state, such as a change in image luminance, or a change in copy control information associated with a content, or is detected on the basis of a flag, a descriptor, or channel switching. In response to detection of a content-to-content transition, a reset signal is output to a WM analyzer to reset current copy control information into a 'undefined' state, so that copy control is performed in a mode such as a copy-free mode assigned to the 'undefined' state.