Nagravision S.a.

Corine Le Buhan

Marco Sasselli

Patrick Bertholet

The objective of the present invention is a storage method in a decoder of an event encrypted by control words that guarantees the access to this event at whichever moment, even if certain keys of the system have changed for security reasons. This objective is achieved by a storage method of an event encrypted by control words in a reception and decryption unit connected to a security unit, said control words and the necessary rights being contained in management messages encrypted by system keys, comprising storing the encrypted event as well as the control messages in the storage unit, and storing in the storage unit the system keys encrypted by a predefined local key stored in the security unit.

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Les Paccots, Switzerland

Corine Le Buhan