Image leak prevention using digital watermark
US8234496B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2009 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Aug 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/16
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Unique digital signatures of sensitive or restricted image files are calculated and stored in a database. A hook routine hooks an open or read command when an application opens an image file in order to check for a restricted digital signature of that image file. If present, a digital watermark is added to the image before the application edits that image. A user may then modify the image. A hook routine also hooks a close or write command in order to check for a digital watermark. If present, the digital watermark is removed and a new digital signature for the revised image is calculated. The digital signature for the revised image is then uploaded to a database associated with a DLP server software product, and then pushed periodically down to endpoint DLP client products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.