Scrambling, descrambling and secure distribution of audio-visual sequences from video encoders based on wavelet processing
US7668312B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 16, 2004 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Oct 24, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for secured distribution of video sequences according to a digital stream format stemming from an encoding based on a processing by wavelets including frames including blocks containing coefficients of wavelets describing the visual elements, including analyzing the stream prior to transmission to client equipment to generate a modified main stream by deletion and replacement of selected information coding the original stream and having the format of the original stream, and complementary information of any format comprising the digital information coding the original stream and suitable for permitting reconstruction of the modified frames; and transmitting the modified main stream and the complementary information separately from a server to addressed equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.