Patent ID: 7895638

Claim:
A method of entering, disabling/erasing scrambled data access rights transmitted from a transmission center to at least one descrambling terminal to which is linked an access control module device equipped with a security processor, these access rights being entered in said access control module, said scrambled data being subjected to an access control by periodic transmission of access control messages, conveying access criteria and a cryptogram of a control word that is changed periodically and encrypted using an operation key, then, in each security processor, conditionally upon verifying a validity of at least one entered access right against said access criteria, by decrypting the cryptogram of the control word using said operation key, transmitting said control word to the descrambling terminal and descrambling said scrambled data using said restored control word, characterized in that it consists at least in: forming any access right entered in said access control module device as a set of independent variables comprising at least: an access right identification variable corresponding to at least an identifier of the entered right and used to reference this right in the access criteria conveyed by the access control messages, an entered access right action date variable indicating the date of entry of the right entered in the access control module when no operation has been performed on said right or the date of execution of the last subsequent operation performed on said right, and a status variable which can have one of three encoded values signifying access right enabled, access right disabled, or access right erased; forming said any access right with linked variables linked to said independent variables; transmitting from said transmission center to each descrambling terminal and to the access control module device linked to said descrambling terminal at least one access right management message, said message comprising at least, in addition to an entered access right identification variable, an action date variable and a status assignment variable, the encoded value corresponding to an enabled access right, a disabled access right or an erased access right; and on receipt of said access right management message, at said access control module, checking and authorization of an update operation by comparing a value of the entered access right action date variable of the access right entered in the access control module device to the action date variable of the access right management message and the value of the status variable of the access right; assigning said action date to the entered access right corresponding to the access right identification variable of said access right management message, and allocating said status assignment variable corresponding to an enabled access right, a disabled access right or an erased access right to said status variable of said corresponding entered access right.