Abstract: The application relates to a method for the secure distribution of digital data transmitted to a client station, said digital data being in a first digital format of a non audiovisual nature, said method implementing a protection device able to protect data in a second digital format and to transmit them to said client station. According to the invention, said second format is of an audiovisual nature and the method includes a step of converting digital data in said first digital format, into said second format.

Abstract: The application relates to a method for distributing a marked audiovisual sequence from a nominal audiovisual sequence, said nominal audiovisual sequence having a nominal content, wherein a first modified flow having a modified content different from the nominal content is generated, and a second marked complementary flow including marked complementary digital information is generated; said first modified flow and said marked complementary information are transmitted, so as to allow the restoration of said marked audiovisual sequence at the receiving item of equipment; an operation of marking said nominal audiovisual sequence is carried out, so as to determine a marked audiovisual sequence having a marked content; a difference is determined between said marked content, on the one hand, and said modified content or said nominal content, on the other hand; wherein said marked complementary digital information depend on said difference.

Abstract: A method for distributing a nominal audiovisual stream to a recipient device including modifying, in the nominal audiovisual stream, at least one nominal coefficient among the nominal coefficients to generate a modified main stream; generating complementary information such that the nominal audio-visual stream may be implemented based from the complementary information and on the modified main stream, applying a plurality of methods for protecting the complementary information to generate multiple protected complementary information, each of the protected complementary information enabling the nominal stream of the main stream to be implemented upon application of an access method compatible with the protection method which has been used to protect it; and transmitting to the recipient device the modified main stream and the multiple protected complementary information.

Abstract: A process for distributing digital video sequences in accordance with a nominal stream format including a succession of frames, each frame including at least one digital block regrouping a plurality of coefficients corresponding to simple, digitally coded visual elements is disclosed.

Abstract: A method for delivering a nominal audiovisual stream including nominal coefficients to a receiving site including a secure gateway includes modifying, in the nominal audiovisual stream, at least one nominal coefficient among the nominal coefficients to generate a main digital stream; generating complementary information so that the nominal audiovisual stream is implemented from the complementary information and main digital stream at the receiving site; performing cryptographic operations on the secure gateway with the complementary information; and causing the gateway to transmit the complementary information to an audiovisual processing peripheral to enable the nominal audiovisual stream to be implemented at the audiovisual processing peripheral.

Abstract: A method for distributing video sequences according to a nominal flow format that describes a multiplicity of audiovisual scenes, each scene including a multiplicity of hierarchized audiovisual objects and a descriptor of the hierarchy and of spatial and temporal relationships among the objects, each video object including at least one complete I-VOP digital plane, including generating a first modified flow having the format of a nominal flow and a second flow of any format including digital information required for reconstruction of modified planes by analyzing the flow of video sequences, separately transmitting the two flows generated 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.

Abstract: A process for secure distribution of digital audiovisual streams according to a standard, normalized or proprietary format including separating an original stream into two parts, transmitting the parts to addressee equipment, generating a modified main stream having a format of the original stream and complementary information with any format including digital information suitable to permit reconstruction of the original stream, and transmitting the modified stream from a distribution server via separate paths during distribution in an extended, secure multicasting mode to the addressee equipment from a secure central server passing via at least one router and at least one switch connecting the addressee equipment to the central server via at least one access point.

Abstract: 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.

Abstract: A process for distributing digital still images according to a nominal format, where each image is broken into blocks and macroblocks that depend upon each other by correlation coefficients including analyzing contents of the still images to generate two parts: a) a primary contents in nominal format corresponding to the image as modified by substitution of certain correlation coefficients with coefficients that are of the same type, but which are random, and b) additional digital nature of any format, which includes substituted correlation coefficients and digital data that are likely to allow reconstruction of the modified image; transmitting separately the modified primary contents in real or deferred time and additional digital information in real time at a moment of viewing from a server towards recipient equipment; and calculating a synthesis of contents of the recipient equipment that is in nominal format as a function of the modified primary contents and the additional data.

Abstract: A process for distributing digital video products with a restriction of at least certain rights of representation and reproduction, including an initial stage of forming a bank of original digital video sequences on a publicly inaccessible server for each request made by a user, and a stage of selection by the user of one or several sequences of the video bank, which selection stage activates a modification stage producing a modified main stream in a nominal format of a selected original video sequence, but whose content was modified by cutting into two parts, a larger part of which is recorded in the modified main stream that cannot be used on standard reading equipment, and a smaller part that is retained in the server within complementary digital information personalized for each user and complementary to the modified main stream, a stage for transmitting the main stream modified at a distribution site, a stage for recording the modified main stream at the distribution site on a standardized support materi

Abstract: A process for distributing digital audio sequences in streams including data sequences containing digital audio blocks including modifying at least a part of the data sequences in an original stream to produce a modified stream in a same nominal format as the original stream, transmitting the modified stream, and reconstructing the original stream with the aid of a decoder, wherein reconstruction of the original stream is adaptive and progressive as a function of information coming from a digital profile of a target.

Abstract: A process for secured distribution of vector visual sequences in at least two dimensions, animated and including a succession of frames containing at least one multidimensional geometric object to be displayed on a screen of a user and determined by at least one parameter including: analyzing the stream prior to transmission to addressee equipment to generate a modified main stream by deletion and replacement of information coding the original visual signal, having a format the same as the format of the original stream, but of which at least one frame was modified, and complementary information of any format including digital information suitable for permitting reconstruction of the modified frames, which modified main stream and which complementary information are transmitted separately to the addressee equipment.

Abstract: A process for distributing video sequences according to a nominal stream format that describes a plurality of audiovisual scenes, each scene formed from a plurality of hierarchical audiovisual objects and a describer of the hierarchy and spatial and temporal relationships between the objects, with each video object comprising at least one digital plane P, including analyzing the nominal stream to generate a first modified stream having a format ofthe nominal stream and having planes P, B or S (GMC) containing macroblocks of which all or part of values of movement vectors were modified, generating a second stream with any format comprising digital information to permit reconstruction of the modified planes, separately transmitting the two streams from the server to addressed equipment, and calculating a synthesis of a stream to the nominal format on the addressed equipment as a function of the first and second streams.

Abstract: 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.