Orange

France Telecom

France Telecom Etablissement Autonome De Droit Public

Viaccess

Telediffusion

Pierre Fevrier

Chantal Guionnet

Claudia Becker

Francoise Coutrot

André Codet

Noel Fontaine

Jean-Pierre Vigarie

Control of access to at least one digital content is managed as a function of at least one access criterion. The digital content is transmitted to at least one terminal in the form a data stream. The access criterion is stored in the terminal as a function of an identifier. The terminal receives the data stream in association with a control message indicating the identifier. It then retrieves the stored access criterion as a function of the identifier received in the control message. Finally, it verifies whether the stored access criterion is satisfied in order, where appropriate, to authorize access to the content.

Digital content access control having improved transmission bandwidth

The invention relates to a protocol for disabling/erasing access rights to scrambled data. According to the invention, the access rights entered in an access control module comprise the following variables: right identification variable (R ID), action date variable (AD V) and right status variable (S V). The status variable can have one of three encoded values, namely enabled, disabled or erased right. The inventive protocol consists in: transmitting (A) at least one access right management message comprising the right identification variable (R ID), the action date variable (AD V) and the status assignment variable (S V), the latter corresponding to a enabled, disabled or erased right; assigning (B) the action date (AD V) of the message to the action date (AD V) of the right entered; and allocating (C) the status assignment variable (S V) of the message, corresponding to an enabled, disabled or erased access right, to the status variable (S V) of the entered access right. The invention is suitable for pay television.

Protocol for entering, disabling and/or erasing scrambled data access rights and the corresponding access control module

An apparatus and associated methodology are provided for distributing individual keys for deciphering scrambled digital data transmitted by a broadcasting system to a plurality of terminals connected to a data exchange network. The broadcasting system includes at least one portal designed to provide the individual keys, at least one scrambling platform and at least one server designed to broadcast the scrambled data. The scrambling period of the data is divided and transmitted into a succession of encoding periods CP, each defining a period of validity of an individual key Ki. A set of individual keys are supplied at each connection of a terminal to the portal. The set of individual keys includes at least one key corresponding to the encoding period CP, and at least one key corresponding to the encoding period CP+1. The terminal has also provided the date of a future connection to collect a set of deciphering keys corresponding to at least a future encoding period if the continuation of the access is authorized.

Method for distributing scrambled digital data decryption keys

A process for the transmission and reception of personalized programs. The program is constituted by personalized program elements containing an identification of the recipient or addressee, the access to each program element being reserved for a single recipient and is conditioned for the possession of an access title covering the access criteria to the service and the possession of an individual identification on the part of each recipient. The access title control message enables users of the service to calculate, on the basis of the single cryptogram of a root control word and the identification of the recipient, all the personalized control words which will enable each recipient and him alone to descramble the elements relating to him.

Process for the transmission and reception of personalized programs

Growing community of inventors

St. Sulpice la Foret, France

Pierre Fevrier