Nagravision S.a.

Philippe Stransky

Pierre Sarda

Bertrand Wendling

Aditee Anil Pathak

Gyanveer Singh

Marco Sasselli

André Kudelski

Andre Kudelski

Joel Conus

Jean-Luc Bussy

Laurent Laffely

Sven Engeström

Sven Engestrom

A method of acquiring access rights to conditional access content. The method comprises receiving an access right on a first terminal through a first communication channel; storing said access right in said first terminal; sending a request for said conditional access content to a content provider, said request containing at least an identifier of an account to which said first terminal is associated, an identifier of the requested content and a piece of information concerning said access right; verifying, by said content provider, the authenticity of said access right using said piece of information concerning the access right; and when there has been a successful verification, marking said access right as used, and sending said conditional access content to at least one terminal linked to said account. The first terminal using near field communication technology (NFC) during at least one transfer of said access rights.

Method for acquiring access rights to conditional access content

An embodiment of the present invention may be deployed in a system comprising a media player and a remote server operably connected to communicate with one another. The invention allows for a settings file to be stored on the remote server, the settings file comprising parameters useful for adjusting different settings on the media player such that rendering of a particular content to be made possible on the media player according to a user's predetermined taste by downloading the settings from the server onto the media player.

Media player for receiving media content from a remote server

A method and system for updating a table of correspondence between a logical address associated to a user unit in a communication network and a unique identification number associated to one of a group of user units managed by a management center, a method where messages are exchanged between said management center and a specific user unit of said group by using said communication network, these messages being forwarded to the logical address of the specific user in said network, the method including searching in said table for the logical address of the user unit in said communication network corresponding to the unique identification number of the specific user unit; sending of messages to the user unit having the concerned unique identification number, to the logical address corresponding to said communication network; and if the messages are received incorrectly, sending a request containing an identifier of said specific user unit.

Method for updating a table of correspondence between a logical address and an identification number

A method for updating a table of correspondence between a logical address associated to a user unit in a communication network and a unique identification number associated to one of a group of user units managed by a management center, a method where messages are exchanged between said management center and a specific user unit of said group by using said communication network, these messages being forwarded to the logical address of the specific user in said network, the method including searching in said table for the logical address of the user unit in said communication network corresponding to the unique identification number of the specific user unit; sending of messages to the user unit having the concerned unique identification number, to the logical address corresponding to said communication network; and if the messages are received incorrectly, sending a request containing an identifier of said specific user unit.

The present invention concerns the generation of a key necessary to decrypt audio/video contents by genuine decoding units. It concerns in particular a method to secure the reception of a broadcast content managed by a control center and encrypted by at least one content key, said content key or a data allowing to recover said content key being transmitted to the decoding units encrypted by a transmission key common to the decoding units, each decoding unit having at least one environment parameter known by the control center, said decoding unit receiving from the control center a first message common to all decoding units and comprising the encrypted transmission key and a second message, pertaining to said decoding unit and comprising correction data dedicated to said decoding unit, the decryption of the transmission key being made using the environment parameter and the correction data.

Method to secure access to audio/video content in a decoding unit

The invention concerns a method for controlling access to encrypted data (CT) by control words (CW), said control words being received by a security module in control messages (ECM) and returned to a unit operating on the encrypted data. Said control messages (ECM) contain at least one first control word (CW) and a second control word (CW), said control words each allowing access to the encrypted data (CT) during a predetermined period called cryptoperiod (CP). Said method includes the following steps: sending said encrypted data to at least one operating unit; and sending control messages (ECM) to said control unit, such a control message (ECM) containing at least two specific control words (CW, CW) being sent to the operating unit after sending the data encrypted by said first control word (CW) and before sending the data encrypted by said second control word (CW). Said method is characterized in that the time shift between sending to the operating unit the data encrypted by said first control word (CW) and sending the control message (ECM) containing said first control word (CW) and said second control word (CW) is more than 75% of the cryptoperiod.

Method for controlling access to encrypted data

In a pay television system, the choice and the confirmation of an impulse purchase are performed by the user on presentation, by means of a screen, of a grid of programmes. The selection by this user of a particular programme of his choice from the grid is subsequently confirmed in the system by an entitlement management message, this message being specific to an impulse purchase. In order to authorize the immediate screening of the selected transmission, the entitlement management message specific to an impulse purchase is contained in the data tied to the presentation of the grid.

Impulse purchase system for pay-television

A method is for securing and verifying an electronic certificate issued by an authority to an owner. The certificate is stored in the memory of a user unit operated by the owner. The user unit transmits all or part of the data of the certificate to the authority. Further, during an initialization phase, the method includes determining, by the authority, a network identifier pertaining to the user unit, and storing, by the authority, the identifier in connection with the data of the certificate. As such, the use of an electronic certificate by individuals other than the owner may be prevented. Further, damages to the owner, in the case of the theft or copying of a certificate, may be avoided.

Method for securing an electronic certificate

The invention refers to a method of updating a multi-operator reception system by administration (EMM) and updating messages between a subscriber management system and one or several decoders of pay television, being the functioning of the decoder dependent on the reception of administration (EMM) and updating messages of at least one preferential operator, this decoder having to pass into stand-by state under certain conditions. If the subscriber uses mostly an operator that does not require subscription rights, the decoder does not receive any more the necessary updating. To switch this decoder into the stand-by state, the method according to the invention carries out the following operations:

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Cheseaux-sur-Lausanne, Switzerland

Philippe Stransky