Protection method for preventing hard copy of document from being released or reproduced
US8085972B2 · kind B2 · utility
1Cited by
16References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2008 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Oct 2, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A protection method for preventing a hard copy of a document from being released or reproduced is provided. The protection method comprises: selecting a pattern with a closed contour line and utilizing a level set method to process the pattern to generate at least a watermark; and embedding the watermark into the document. In addition, the protection method can further comprise: detecting the hard copy of the document to determine whether at least a watermark exists in the hard copy of the document; and forbidding releasing or reproducing the document when the watermark is detected in the hard copy of the document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.