Protection method and device for the secure distribution of audio-visual works

1. A process for secure distribution of video sequences codes in accordance with a nominal stream format comprising visual data and data for configuration of decoding of the video sequences codes that does not represent the visual data, the process comprising:

receiving a first video stream having a nominal video format;

analyzing and storing data related to the configuration of the decoding of the first video stream, the stored data representing data necessary for the configuration of the decoding;

modifying the first video stream to replace intercalate the stored data with false decoding data of the same nature as the stored data while maintaining the nominal video format to obtain a modified second video stream, the false decoding data being a modification of the data for the configuration of the decoding, wherein the modified second video stream is incorrect from a visual standpoint of a human but correct from an MPEG format standpoint;

creating a third stream with the stored data, wherein the third stream represents a portion of the data of the first video stream;

transmitting the modified second video stream and the third stream in separate streams to a receiving device; and

aggregating in the receiving device the second modified video stream and the third stream by replacing the stored data contained in the third stream into the second modified video stream to obtain the first video stream.

2. The process of claim 1 , wherein the data for the configuration of the decoding comprises a scanning type applied to the first video stream.

3. The process of claim 1 , wherein the data for the configuration of the decoding comprises a reference that represents a quantification parameter applied to the first video stream.

4. The process of claim 1 , wherein the data for the configuration of the decoding comprises a reference that represents a re-initialization value applied to the first video stream.

5. The process of claim 1 , wherein the nominal stream format comprises pictures comprising blocks of coefficients, and wherein the data for the configuration of the decoding comprises data defining a mode of organization of coefficients in the nominal stream format for its transmission.

6. The process of claim 1 , wherein the nominal stream format comprises pictures comprising blocks of coefficients, wherein the coefficients are quantified according to at least one quantification step, and wherein the data for the configuration of the decoding comprises data permitting calculation of the quantification steps.

7. The process of claim 1 , wherein the nominal stream format comprises pictures comprising blocks of coefficients, wherein at least one of the coefficients is calculated from a previously determined predictor and from a differential value contained in the nominal stream format, and wherein the data for the configuration of the decoding comprises data permitting calculation of re-initialization values of the predictor.

8. The process of claim 1 , wherein a plurality of decoding parameters defined by the data for the configuration of the decoding are modified.

9. The process of claim 8 , wherein modifications made to the data for the configuration of the decoding vary during the analysis.

10. The process of claim 1 , wherein the nominal stream format is based on a MPEG-2 norm.

11. A system for secure distribution of video sequences comprising:

an apparatus for production of a video stream that employs a nominal stream format comprising visual data and data for configuration of decoding of the video stream that does not represent the visual data, wherein, prior to transmission to client equipment, wherein the apparatus is configured to:

analyze and store data related to the configuration of the decoding of the first video stream, the stored data representing data necessary for the configuration of the decoding;

modify the first video steam to intercalate the stored data with false decoding data of the same nature as the stored data while maintaining the nominal video format to obtain a modified second video stream, the false decoding data being a modification of the data for the configuration of the decoding, wherein the modified second video stream is incorrect from a visual standpoint of a human but correct from an MPEG format standpoint;

create a third stream with the stored data;

transmit the modified second video stream and the third stream in separate streams to a receiving device; and

aggregate in the receiving device the second modified video stream and the third stream by replacing the stored data contained in the third stream into the second modified video stream to obtain the first video stream;

the system further comprising:

at least one device for re-composition and viewing of the first video stream; and

at least one telecommunication network between the production apparatus and the device of re-composition equipment for communication therebetween.

12. The system of claim 11 , wherein the data for the configuration of the decoding comprises a scanning type applied to the first video stream.

13. The system of claim 11 , wherein the data for the configuration of the decoding comprises a reference that represents a quantification parameter applied to the first video stream.

14. The system of claim 11 , wherein the data for the configuration of the decoding comprises a reference that represents a re-initialization value applied to the first video stream.

15. The process of claim 1 , wherein the third stream is transmitted in response to a request by a user.