Session based watermarking of media content using encrypted content streams
US9516359B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 2015 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Apr 13, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/2393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods for session based watermarking of media content using encrypted content streams are provided. At least two content streams of the same media content are watermarked with different watermark information and encrypted using different encryption percentages. During a playback session, a unique sequence is generated and provided to a client device for use by the client device in selecting consecutive content segments from the different content streams to produce the original media content with a watermark that uniquely identifies a user of the client device. When selecting the different content segments, the client device compares the encryption percentage of certain selected content segments with the expected encryption percentage for those content segments to determine whether the content streams have been tampered with.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.