Nagravision S.a.

Nagracard S.a.

Other

André Kudelski

Pierre Sarda

Bertrand Wendling

Christophe Nicolas

Marco Sasselli

Nicolas Fischer

Philippe Stransky

Bernard Benoit

Laurent Laffely

Jean-Claude Fournier

A method () of and a device for rendering content data of a content data stream. From content data identified in the content data stream, a level of toxicity is determined (). The level of toxicity represents a measure of authenticity of the received content data stream. Content data of the received content data stream is rendered () based on an aggregated level of toxicity.

Method of and a device for rendering content data of a content data stream based on a level of toxicity of the content data stream

Example embodiments relate to a system to prevent manipulation of transmitted video data including an Integrated Receiver Decoder (IRD) receiving audio/video data and a display device. The IRD may include a device to transmit an HDMI compliant audio/video stream toward the display device. The system may further include a device to add an over-encryption layer to the HDMI/HDCP stream before reaching the display device and a device to remove the added encryption layer so as to recover the HDMI/HDCP stream, before processing the HDMI/HDCP stream by the display device.

System and method to prevent manipulation of transmitted video data

A system includes a remote control device and a security device, wherein both devices share a unique and constant common key, algorithms or protocol specific to a pair formed by the remote control device and the security device. The unique and constant common key, algorithms or protocol are set up during a device initialization phase. The remote control device is configured to communicate wirelessly with a receiver of the security device. The remote control device, which is paired with the security device sending data towards the receiver, includes an encryption module and a memory to store the unique and constant common key. The data is encrypted by the encryption module with the unique and constant common key, and the security device includes a decryption module and a key corresponding to the unique and constant common key to decrypt the data received from the remote control device.

Secure remote control for audio/video receiver/decoder

The aim of the invention is to provide a solution to ensure that the content sent by the IRD is the content effectively displayed on the screen. It is then proposed a system to prevent manipulation of transmitted video data comprising an Integrated Receiver Decoder (IRD) receiving audio/video data, a display device (TV), said IRD comprising means to transmit an HDMI compliant audio/video data stream toward the display device. This system comprising:

A method for sharing data and synchronizing broadcast data with additional information, the broadcast data and the additional information being provided by at least two distinct sources to a multimedia device. The method comprises steps of:

Method for sharing data and synchronizing broadcast data with additional information

The aim of the present invention is to provide a secure system-on-chip for processing data, this system-on-chip comprising at least a central processing unit, an input and an output channel, an encryption/decryption engine and a memory, characterized in that, said input channel comprises an input encryption module to encrypt all incoming data, said output channel comprising an output decryption module to decrypt all outgoing data, said central processing unit receiving the encrypted data from the input encryption module and storing them in the memory, and while processing the stored data, said central processing unit reading the stored data from the memory, requesting decryption of same in the encryption/decryption engine, processing the data and requesting encryption of the result by the encryption/decryption engine and storing the encrypted result, outputting the result to the output decryption module for decryption purpose and exiting the decrypted result via the output channel.

Secure system-on-chip

The aim of the present invention is to provide a secure system-on-chip for processing data, this system-on-chip having at least a central processing unit, an input and an output channel, an encryption/decryption engine and a memory. The system-on-chip having real-time working conditions while receiving and sending data, having an autonomous supervision module which is preprogrammed with normal working conditions definitions of at least the input and/or output data flow to enable or disable the input/output channel according to the comparison on the real-time working conditions and the normal working conditions definitions.

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

At the moment of the diffusion of Pay-TV with multi-channel signals, each channel is associated to authorization messages (ECM) which allow to decrypt this channel according to the rights of the subscriber. When changing channel, a very short time is accepted before one has determined these new rights in relation with the new channel. The heavy encrypting algorithms are thus excluded. To avoid this drawback, to decrypt a channel, a system is proposed using the combination of the authorization information for a channel (ECM), and thus encrypted by a fast algorithm, with authorization information (MECM) for a group of channels. These latter are encrypted by a high security algorithm and are thus slower to decrypt.

Method and system for transmission of decrypting information

System for controlling the transmission of information between a receiver and a security module, especially for a pay television system, in which the transmitted information is encrypted and decrypted by means of a unique encryption key stored, on the one hand, in the receiver and, on the other hand, in the security module.

Mechanism of matching between a receiver and a security module

The aim of this invention is to propose a flexible solution to the risk represented by the interception of data by an unauthorized party during the transmission of said data between a broadcast center and a specialized decryption/decompression circuit such as is used in a Pay-TV decoder. This aim is achieved by a data transmission method involving a broadcast center or diffusion center, a management center and a multimedia unit, the latter comprising at least one unique key and a security module having a transport key.

Data transmission method between a broadcasting center and a multimedia unit

The aim of this invention is to improve in an optimal way the security of smart cards to prevent the fraudulent control of a cryptographic processor(s) by means of external signals that interfere with the normal development of the tasks of a processor(s). This aim is reached by a component IC of a security module comprising at least two processors CPU A, CPU B each connected to program memories ROM A, ROM B, to non-volatile programmable and erasable memories (EEPROM) EEPROM A, EEPROM B containing the data and random access memories (RAM) RAM A, RAM B that serve as temporary data storage during processing, the first processor CPU A having an interface bus toward an exterior of the component IC, characterized in that the second processor CPU B is connected to the first processor CPU A through an exchange memory DPR, the non-volatile programmable and erasable memory EEPROM A of the first processor CPU A having read-only access R for said first processor CPU A, the second processor CPU B having read and write access R/W on said non-volatile programmable and erasable memory EEPROM A of the first processor CPU A.

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Lutry, Switzerland

André Kudelski