Nagravision S.a.

Yann Bieber

André Nicoulin

Blaise Lugeon

A method for securely receiving a multimedia content by a client device operated by one or more operator(s) involving a dedicated provisioning server of a security provider managing symmetric secrets used by the client devices and operators license servers. The provisioning server provides to the client device one or more generations of operator specific unique device secrets, which are then exploited by the various operators' license servers to deliver licenses such that authorized client devices can consume protected multimedia contents.

Secure provisioning, by a client device, cryptographic keys for exploiting services provided by an operator

A device () for generating a watermarked stream (), comprising: at least one input interface () configured to receive encrypted control messages () and conditional access streams () including a main stream () and protected watermarking data streams () from which a watermarking information () can be embedded in said watermarked stream (); a security module () configured to process said control messages () and to control access to said conditional access streams (); a descrambler () configured to remove protection applied on at least some of said conditional access streams (); a watermarking unit () configured to generate the watermarked stream () from said conditional access streams () by selectively processing said watermarking data streams () depending on access data (AC, AR) included in some of said control messages ().

Methods, devices and system for generating a watermarked stream

Method for distributing multimedia licenses by a server to a plurality of user devices in a distribution system of a multimedia service, the access of which is protected by a first protection. This method comprising verifying that computing resources used by the server do not exceed a maximal threshold, if so, generating and then transmitting regular licenses including said first protection in response to user device requests, otherwise switching the server to a singular mode of distribution aiming to protect the access to the multimedia service using a second protection, independent of the first protection; to generate and to transmit to the devices one singular license comprising the second protection; to verify that the computing resources do not exceed the maximal threshold, if so, to switch from the singular mode to a regular mode so as to protect the access to the multimedia content using only said first protection.

Method and device for distributing multimedia licences within a distribution system of a secured multimedia service

A method for securely transferring digital content between two electronic devices, comprising an activation phase performed by a management center for generating a common network key, calculating for each device an encrypted network key with a unique device key and transmitting to each device the encrypted network key and a unique device value involving said device key and a unique device secret value, a keys recovering performed by each device for obtaining the device key from both the device value and the secret value of said device and obtaining the network key from both the encrypted network key and the previously obtained device key, and an operating phase performed by each device for generating or obtaining a random value, generating a final key by encrypting the random value with the network key and using said final key for encrypting/decrypting said content.

Method, system and device for securely transferring digital content between electronic devices within a communication network managed by a management center

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Lausanne, Switzerland

Yann Bieber