Recording of scrambled digital data
AssigneeCanal+ Societe Anonyme
InventorsMichel Maillard, Christian Benardeau
Life of this patent
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Abstract
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.
Claims19
A system for transmission and recording of digital data, comprising:
- a transmission means adapted to prepare and transmit at least one control word encrypted by a first key together with digital data scrambled by that control word;
- a digital recording device adapted to receive and record on a digital support the transmitted scrambled digital data together with the encrypted control word, the digital recording device including an access control unit adapted to decrypt the encrypted control word and thereafter descramble the scrambled digital data during playback, wherein said access control module comprises a credit unit adapted to control a number of recordings made by the digital recording device.
A method of transmission and recordal of digital data, comprising:
- preparing and transmitting digital data together with at least one control word using a transmission means;
- recording the transmitted scrambled data and encrypted control word on a digital support using a digital recording device, the digital recording device comprising an access control means;
- decrypting the encrypted control word and thereafter descramble the scrambled digital data during playback using the access control means, wherein said access control module comprises a credit unit for controlling a number of recordings made by the digital recording device.
Dependencies are inferred from the claim text.