Method for watermarking media content and system for implementing this method
US9571899B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2014 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Apr 11, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/8355
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for watermarking digital media content received in a form of at least one encrypted sample to which metadata is assigned. Each sample is encrypted by means of a sample key. The metadata comprises first data, second data and a signature resulting from the first and second data. The first data is encrypted by a transport key and comprises at least a content key and watermarking metadata. The second data comprises an initialization vector so that the content key and the initialization vector form a unique pair of cryptographic data equivalent to the sample key. The method comprises the steps of extracting the metadata from the media content, decrypting the first data by using the transport key, authenticating the signed data and, in case of positive outcome, descrambling each sample by using the pair of cryptographic data, and marking each descrambled sample by using the watermarking metadata.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.