LFSR watermark system
US9208352B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2014 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Apr 7, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0063
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a system including a processor is operative to receive a content item including a watermark encoding a series of data values of an output stream of a linear feedback shift register initialized with a seed including an information element and an assurance value, the shift register having a plurality of states each including a first and second value, identify at least part of the watermark in the content item, extract at least some of the data values from the at least part of the identified watermark, process at least some of the extracted data values yielding the initial state of shift register, and authenticate the first value of the initial state using the second value of the initial state in order to confirm that the first value is indeed the information element included in the seed processed by the shift register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.