Viaccess

Vincent Hamon

Gilles Dubroeucq

This method of reading a video stream comprises:

Method of reading and generating a video stream containing compressed and encrypted images

This method for reading a video stream comprises a step of comparing a datum characteristic of a behavior of a user with a set of predetermined thresholds, each of which, when it is crossed, characterizes an abnormal behavior of the user, a step of signaling an abnormal behavior if at least one predetermined part of these thresholds is crossed, and, otherwise, the absence of this signaling of an abnormal behavior, and a step of executing a counter-measure which makes it more difficult or impossible to access the set of information items contained in a first baseband video stream on the basis of various proofs of a second baseband video stream composed by a first terminal, this execution step being triggered automatically in response to the signaling of an abnormal behavior and not being triggered in the absence of this signaling of an abnormal behavior.

Method for reading a video stream

The invention relates to a method for processing multimedia streams, in particular to verify access rights to a content of said multimedia stream, the multimedia stream being provided by a server device connected to a communication network, and downloadable by a client device via data formatted in a markup language, by using software for browsing and displaying data formatted in a markup language, cooperating with software for reading multimedia streams, the multimedia stream comprising at least one video stream able to be displayed in the form of pixels in a display zone () of a display screen of the client device. The method includes determining a display zone (), allocated by said browsing and display software to the software for reading multimedia streams in order to display a video stream extracted from said multimedia stream, and recording at least one digital image formed by values of the pixels to be displayed in the display zone () determined at a given time.

Method and device for processing a multimedia stream to verify access rights

A terminal identification method which acquires then decodes multimedia temporal content to generate a multimedia stream in unscrambled form with at least one temporal succession of time intervals. A set of information bits for displaying an image or playing a sound being transmitted during a single time interval. The terminal identification device transmits an identification command to the terminal and the terminal triggers and alternately inhibits a predetermined modification of at least some of the information bits necessary for playing a sound or displaying an image contained in the multimedia stream to obtain a modified multimedia stream and transmits the stream as a multimedia. The device acquires the modified stream transmitted by the terminal and determines the identifier of the terminal to which it belongs on the basis of the transmitted command and the presence or absence of the predetermined modification in the acquired stream.

Terminal identification method in a system for providing multimedia content

A method for transmitting and receiving multimedia content having cryptoperiods scrambled by a control word includes a sender using an operating key and an encryption algorithm in a first virtual mother card to encrypt the control word to obtain a cryptogram, using a syntax constructor also in the first virtual mother card to generate an ECM that incorporates the cryptogram, and transmitting it to a terminal. The terminal receives the ECM and using a syntax analyzer contained in a first virtual daughter card associated with the mother card and uses it to locate a position of the cryptogram CW*t in the ECM. Using an operating key of a decryption algorithm in the daughter card, it then decrypts the cryptogram. Then, using the decrypted control word, it proceeds to descramble the cryptoperiod. Meanwhile, the sender occasionally changes the virtual mother card into a different virtual mother card.

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Rennes, France

Vincent Hamon