FIELD: information technology.
SUBSTANCE: method of authorising access to an encrypted digital data product, which comprises steps for storing at least one set of access rights in security device, wherein each access right includes a product identifier and information on expiry of validity, receiving an access control message from the decryptor system, which includes a device for decrypting the encrypted digital data products using control words, wherein each access control message includes a product identifier and, in a first mode, a step for returning at least one control word in response to the access control message, and, in a second mode, a step for progressive setup of the counter to a preset value and a step for returning at least one control word in response only to the access control message.
EFFECT: preventing long periods during which an encrypted digital data product cannot be accessed due to expired access rights.
13 cl, 3 dwg
