Dynamic digital watermark
US9497349B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 2014 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Sep 1, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Some implementations may provide a computer-implemented method for validating a digital document, the method including: receiving, at a computing device, the digital document comprising at least two digital watermarks, the digital document issued by a central entity; retrieving a first digital watermark from the digital document, the first digital watermark visually presented at a first time point; retrieving a second digital watermark from the digital document, the second digital watermark visually presented at a second time point, the second digital watermark being different from the first digital watermark and the second time point being different from the first time point; and reading the digital document based on the retrieved first and second digital watermarks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.