Other

Thomson Licensing S.a.

Canal+ Societe Anonyme

Nagra Thomson Licensing

Canal+ Technologies

Logiways France

Christian Benardeau

Michel Maillard

Jean-Luc Dauvois

A system for transmitting and recording digital data is included. Further, a system for transmitting transmit scrambled audio data that is to be recorded on a mini disc reader is included. A system for transmission and recording of digital data includes transmission means adapted to prepare and transmit scrambled digital data together with at least one encrypted control word and a digital recording device adapted to receive and record the scrambled digital data and encrypted control word on a digital support. The digital recording device further includes an access control means adapted to decrypt the control word and thereafter descramble the digital data during playback.

Recording of scrambled digital data

A method of guaranteeing the integrity of at least one computer software program transmitted by a transmitter to a decoder which is equipped with an encryption/decryption module via a long-distance information transmission network. The inventive method includes inserting (at) a supplementary piece of information into a message containing the information necessary for the decoder to decrypt the information signals transmitted by the transmitter, the supplementary information enabling the encryption/decryption module to verify that it has effectively received each computer software program transmitted.

Method and system for guaranteeing the integrity of at least one software program which is transmitted to an encryption/decryption module and recording media for implementing same

A method and apparatus for the transmission and reception of scrambled data is disclosed. In some embodiments, the method and apparatus includes transmitting a scrambled data stream to a decoder, sending the scrambled data stream to a portable security module inserted in the decoder, descrambling the scrambled data stream, encrypting a descrambled data stream, and using the encrypted data stream to the decoder, decrypting the encrypted data stream, and using the decrypted data stream.

Method and apparatus for encrypted data stream transmission

A method relating to recording transmitted digital data in which transmitted digital information is encrypted by a recording encryption key. The recording encryption key is stored by a recording means on a recording support medium. Further, the recording encryption key is characterized in that an equivalent of the recording encryption key is encrypted by a recording transport key, which is also stored on the support medium with the encrypted information.

Method and apparatus for recording of encrypted digital data

The present invention relates to a method of providing secure communication of information between at least a first and second digital audiovisual device () and characterized in that the first device () communicates to the second device () a certificate Ct(KpubT) comprising a transport public key KpubT encrypted by a management private key KpriMan, the second device () decrypting the certificate using an equivalent management public key KpubMan and thereafter using the transport public key KpubT to encrypt information sent to the first device, the first device using an equivalent private key KpriT to decrypt the information. The present invention is particularly applicable to a method of providing secure communication between a first and second decoder.

Method and apparatus for secure communication of information between a plurality of digital audiovisual devices

A method of restricting access to recorded digital data on a digital support medium ( ) using an integrated circuit e.g. on a smart card ( ) containing a first decryption key (Kf) characterized in encrypting with a corresponding encryption key (Kf) one or more elements of the volume descripter (V) of the support medium ( ), recording the encrypted elements of the volume descripter together with non-encrypted data on the support medium and, when accessing the support medium ( ), using the integrated circuit decryption key (Kf) to decrypt the encrypted elements of the volume descripter (V) and to supply a reader ( ) with these elements so as to permit the reading and/or writing of non-encrypted data on the support medium ( ).

Method and apparatus for recorded digital data protection via media volume

A smartcard for use with a receiver of encrypted broadcast signals comprises a microprocessor for enabling or controlling decryption of said signals. A memory is coupled to the microprocessor. The microprocessor is adapted to enable or control the individual decryption of a plurality of such signals from respective broadcast suppliers of such signals by means of respective dynamically created zones in the memory, the dynamically created zones each being arranged to store decryption data associated with a respective one of said broadcast suppliers.

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Bussy Saint Georges, France

Christian Benardeau