Methods and apparatus for watermarking and distributing watermarked content
US8848969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2011 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Jun 11, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/1063
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for generating and distributing watermarked content are described. Content to be distributed is sliced into a plurality of segments, e.g., short portions. Individual segments are subjected to watermarking with multiple watermarked versions of a segment being generated. Different watermarked versions of a segment communicate different information, e.g., one or more numbers. Sets of watermarked segments corresponding to a program are supplied to a content distribution device. Based on a session number or other information corresponding to the destination of the content, the content distribution device selects watermarked segments from the sets of segments to provide to the user. The combination of segments communicates, via the watermarks, a sequence of numbers used to identify the streamed content without requiring the distribution node to perform image processing to generate the watermarks. When the segments are communicated sequentially, the watermarks can be detected and the identifying numerical sequence extracted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.