Linking documents through digital watermarking
US6869023B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2002 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Jul 27, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3274
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to linking documents through digital watermarking. In one implementation, an identification document is embedded with a first digital watermark. The first digital watermark includes a first identifier. Before issuing a second document, like a boarding pass or ticket, the first identifier is extracted from the identification document. The first identifier is manipulated or altered to produce a second identifier. The second identifier, however, remains related to the first identifier. The second document is embedded with a second digital watermark including the second identifier. Thus, the identification document and the second document are linked through the first and second watermark identifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.