Server-side watermark data writing method and apparatus for digital signals
US7185200B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1999 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Sep 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3283
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digitized signal is published with a blank watermark, i.e., a watermark which contains no specific watermark data, and a server computer system encodes specific watermark data into the watermark signal for each delivery of the digitized signal. A basis signal which is used to watermark a digitized signal is predetermined to enable embedding of transaction-specific watermark data to be embedded in the subject signal with minimal processing resources. Since the basis signal generally accounts for the majority of the processing resources required to watermark the subject signal, only a relatively small portion of the requisite processing resources are used to embed transaction-specific watermark into the subject signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.