Enhanced copy protection of proprietary material employing multiple watermarks
US6931536B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2001 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Jun 2, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/23892
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for distributing proprietary material employs multiple watermarks embedded in the proprietary material for enhanced copy protection. A first watermark is to be processed by programmable and non-programmable devices configured to process the first watermark for copy protection of the proprietary material. If a programmable device eliminates the first watermark so that unauthorized copies of the proprietary material can be made, then non-programmable devices configured to process a second watermark as well as the first watermark look for and process the second watermark for copy protection of the proprietary material upon their failure to detect the first watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.