Copy protection for digital motion picture image data
US7043019B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2001 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | Mar 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91392
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for displaying a copy-deterrent pattern (104) within a digital motion picture in order to discourage recording of the motion picture using a video camera or other sampling recording device. A copy-deterrent pattern (104) could be, for example, one or more symbols, a random pattern, a digital watermark or a text message (106). The copy-deterrent pattern (104) comprises a plurality of pixels within each frame of the digital motion picture, and the displayed pixel intensities are modulated at a temporal frequency using modulation characteristics deliberately selected to be imperceptible to human observers while simultaneously producing objectionable aliasing in any copy made using a video camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.