Abstract: A method of indexing a video document represents the video document in the form of a parallelepipedal volume obtained by juxtaposing, on a time axis, successive frames of the video document where each frame is represented by a matrix of pixels in a two-dimensional space. A space-time video slice of the video document is constructed by extracting a set of pixels for each frame of the video document in a same line defined relative to a first direction of the frames and juxtaposing the lines of pixels corresponding to the frames on a time axis to form a space-time video slice of a length defined by the juxtaposed lines of pixels and of a height equal to the length of the lines extracted from each of the frames. The length is a function of the dimension of the frames in a second direction and the orientation of the lines. The colorimetric values of the pixels of the lines of the space-time video slice are initialized on the basis of the content of the lines extracted from the frames of the video document.

Abstract: The method comprises: taking a digital document for protection that constitutes a piece of source code, and identifying therein a programming language L defined by a grammar GL; associating an action grammar module with said programming language L; performing a structural characterization of the code in a single syntactic analysis pass on the basis of the action grammar module; this being done by constructing a grammar dictionary GDL associated with the programming language and comprising a set of structural terms such that each of these terms is associated with a rule or a set of rules belonging to said grammar (GL) and by transforming the source code into a structural sequence (RL, TL, GDL) comprising the set of structural terms and the dictionary GDL of the grammar of the language L; proceeding in the same manner to transform a digital document for analysis into a structural sequence (RL, TL, GDL); and measuring the plagiarism ratio between the source code of the digital document for protection and the sou

Abstract: The method of indexing multimedia documents comprises the following steps: a) for each document identifying and extracting terms ti constituted by vectors characterizing properties of the; b) storing terms ti in a term base comprising P terms; c) determining a maximum number N of desired concepts that group together the most pertinent terms ti; d) calculating the matrix T of distances between the terms ti of the term base; e) decomposing the set P of terms ti of the term base into N portions Pj (1?j?N) such that P=P1? P2 . . . ? Pj . . .

Abstract: The method for identifying and filtering multimedia data consists of monitoring off-line, on a data transmission network, multimedia data with reference to reference multimedia data and using an on-line intervention module to intercept, query or listen to the multimedia data recognized on-line using formal data stored in a formal activation database generated during off-line monitoring using suspicious data obtained during a search for multimedia data on the network.

Abstract: The system for intercepting multimedia documents disseminated from a network comprises an interception module (110) for intercepting and processing information packets, which module comprises a packet interception module (101), a packet header analyzer module (102), a module (104) for processing packets recognized as forming part of a connection that has already been set up in order to access a storage container where the data present in each received packet is saved, and a module (103) for creating an automaton for processing received packets belonging to a new connection. The system further comprises a module for analyzing the content of the data stored in the containers, for recognizing the protocol used, for analyzing the content transported by said protocol, and for reconstituting the intercepted documents.