Secured device for the processing of high-quality audiovisual works
A method for distributing video sequences according to a nominal flow format including a succession of frames, each including at least one I block corresponding to a complete digital I image, each I image being broken down into blocks and macroblocks dependent on each other by correlation coefficients, including: analyzing a flow of sequences; generating a first modified flow having a format of a nominal flow and having I images modified by substitution of selected correlation coefficients by coefficients of the same type, but being random, and a second flow of any format including the substituted correlation coefficients and digital information which can enable reconstruction of the modified images; transmitting the first and second modified flows from a server to destination equipment; and calculating on the destination equipment a synthesis of a flow of the nominal format as a function of the first and second flows.
1. A method for distributing video sequences according to a nominal flow format including a succession of frames, each comprising at least one I block corresponding to a complete digital I image, each I image being broken down into blocks and macroblocks dependent on each other by correlation coefficients, comprising:
analyzing a flow of sequences;
generating a first modified flow having a format of a nominal flow and having I images modified by substitution of selected correlation coefficients by coefficients of the same type, but being random, and a second flow of any format comprising the substituted correlation coefficients and digital information which can enable reconstruction of the modified images;
transmitting the first and second modified flows from a server to destination equipment; and
calculating on the destination equipment a synthesis of a flow of the nominal format as a function of the first and second flows.
2. The method according to claim 1 , wherein each frame comprises at least one P block corresponding to differences between an image referred to as a P image and at least one other I and/or P image.
3. The method according to claim 2 , wherein at least one P image is modified in the same manner as the I images.
4. The method according to claim 1 , wherein the nominal flow format is defined by a MPEG-1 or MPEG-2standard.
5. The method according to claim 1 , wherein the analysis can determine which I and/or P images to modify.
6. The method according to claim 1 , wherein analysis can determine the correlation coefficients to modify.
7. The method according to claim 1 , wherein transmission of the first flow is implemented via a physically distributed material support.
8. The method according to claim 1 , wherein transmission of the first flow is implemented via a broad band network or DAB.
9. The method according to claim 1 , wherein transmission of the second flow is implemented via a switched telephonic network or via a DSL type network or via a LRL network (local radio loop) or via a mobile telephonic network using GSM, GPRS or UMTS standards.
10. The method according to claim 1 , wherein transmission of the second flow is performed via a physically distributed material support.
11. The method according to claim 1 , wherein transmission of the second flow is implemented via a broad band network of the same type as the network used for the first flow.
12. The method according to claim 1 , wherein transmission of the broad band flow is implemented via the same broad band network as the network used for the first flow.
13. The method according to claim 1 , wherein transmission of at least one of the two flows is encrypted.
14. The method according to claim 1 , wherein at least one of the two flows is watermarked.
15. The method according to claim 1 , wherein the two generated flow are intended for a single equipment unit, a group of equipment units or all equipment units.
16. The method according to claim 1 , wherein reconstruction is contingent on a transaction.
17. The method according to claim 1 , wherein reconstruction can be authorized by consultation of a private copy requested by the client.
18. Apparatus for distributing a video flow according to the method of claim 1 , comprising at least one multimedia server containing original video sequences including a device for analysis of the video flow originating from the server for generating the first and second flows.
19. The apparatus according to claim 18 , further comprising a memory for recording a “private copy” marker indicating for each sequence rights of each user.
20. Apparatus for distributing a video flow according to the method of claim 1 , comprising a standard flow decoder, at least one recording interface intended for storing the content of the first flow and at least one display interface, and a means for reconstituting the original flow from the first and second flows.
21. The apparatus according to claim 20 , wherein the reconstituting means is a software program.
22. The apparatus according to claim 20 , wherein the reconstituting means is a software program on a smart card.
23. The apparatus according to claim 20 , wherein the reconstituting means is an electronic device.
24. The apparatus according to claim 20 , wherein, in the case of installation on a computer, the reconstituting means uses a resource specific to the product to prevent copying of temporary information on a permanent support.
25. The apparatus according to claim 20 , wherein the recording interface also stores a “private copy” marker in relation to the first flow indicating for the sequence rights of a user.
26. The apparatus according to claim 20 , further comprising a smart card reader enabling identification of a client to display an audiovisual program recorded on the interface.
27. A system for transmitting a video flow comprising the apparatus according to claim 18 , at least one equipment unit for exploitation of a video flow according to claim 20 , and at least one communication network between the production equipment and the exploitation equipment unit(s).