Watermarking in an audiovisual product
US7783888B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2007 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | May 26, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10537
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audiovisual product (400) is recorded with a set of watermark characters (421, 701) as video or audio objects. A sequence of the watermark characters (421, 701) is selected and reproduced upon playback to uniquely identify a particular playback instance. Ideally, a user identity code is received upon playback amongst a predetermined set of user identity codes, and the sequence of watermark characters (421, 701) is selected and replayed according to the received user identity code. The sequence of watermark characters (421, 701) allows the user identity code to be traced should the audio and/or visual output of the audiovisual product (400) be recorded such as with a video cassette recorder (VCR).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.