System and method for controlling contents by plurality of pieces of control information
US7577843B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2004 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Jul 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91335
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
At least one kind of control signal concerning control of contents, added to specific locations inside contents data, is detected as first control information, and at the same time, at least one kind of control information concerning control of contents, embedded inside the contents data by a digital watermark, is detected as second control information. Consistency between the first control information as detected, and the second control information as detected is determined and on the basis of results of the determination, the control of the contents is executed. Thus, it is possible to reduce a possibility of the contents being improperly copied, thereby enabling the control with assurance of still higher safety.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.