Watermark-based access control method and device
US7533266B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2003 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Dec 12, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2137
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of controlling access to a resource using a verifying device uses watermarking device that embeds an authorization code in a signal using watermarking technology. The watermarked signal is then transmitted to a verifying device, e.g. as a television or radio program or as a commercial related to the resource. In the verifying device, the authorization code is extracted from the watermarked signal and an operation to be performed on the resource is authorized in dependence on the extracted authorization code. Preferably the authorization includes permission for executing a program, rendering and/or copying a multimedia object or for activating a cheat function in an electronic game.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.