Nagravision S.a.

Christian Wirz

Olivier Brique

Xavier Carrel

Patrick Hauert

Henri Kudelski

Jimmy Cochard

Sébastien Erard

Grégory Duval

Gregory Duval

The aim of the present invention consists of reducing the switching time from one reception channel to another. In fact, this reduction will be particularly discernable since the number of different rights stored in a security module of a multimedia unit or decoder is high. When a user selects a service among those proposed by an electronic programs guide, an access control module explores a stored service information table in order to extract an access condition associated to the service. This access condition allows determining an index in a rights table stored in the access control module of a right that fulfills the access condition. The access control module transmits to the security module the index thus determined alone or accompanied by a control message. This index allows the security module to find quickly the right that it compares afterwards with the access condition included in the control message after decryption of the latter.

Method for evaluating user's rights stored in a security module

This invention concerns a security module deactivation and reactivation method particularly intended for access control of conditional access data. These security modules include a plurality of registers (R, R, R, Rn) containing values. The method includes the step of sending at least one management message (RUN-EMM) containing an executable code, this executable code being loaded into a memory of the security module and then executed. The execution of this code in particular can carry out the combination and/or the enciphering of the values of the registers, or render these values illegible. This method also allows the reactivation of the security modules that have been deactivated previously. In this case, the method includes the step of sending another message containing an executable code (RUN-EMM) for the reactivation of the modules, this executable code having an inverted function to that of the executable code used for the deactivation of the security modules.

Method for deactivating and reactivating security modules

The aim of this invention is to be able to recover specific information of a security module when it has been replaced by a new module in a user unit connected to a broadcasting network. This aim is reached by a method of storage and transmission of information generated by a first security module connected to a user unit, this first security module comprising a unique identifier and information representative of its functioning, this first module being able to be replaced by a second security module, this method comprising the following steps:

Method for storing and transmitting data generated by security module

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Lausanne, Switzerland

Christian Wirz