METHOD FOR MANAGING THE RIGHTS OF AN ENCRYPTED CONTENT STORED ON A PERSONAL DIGITAL RECORDER

摘要

The aim of the invention is to provide a method for storing an event which is encrypted by control words (CW) guaranteeing access to said event at any moment, even if certain modifications occur in the designation of the identifiers of said events between the moment of storage and the moment of visualization.This is achieved by means of a method for storing such an event in a receiving and decrypting unit (STB) connected to a security unit (SC), said control words (CW) and the required rights being contained in control messages (ECM). The inventive method is characterized in that it comprises the following steps: the encrypted event is stored, along with the control messages (ECM), on the storage unit; the control messages (ECM) are transmitted to the security unit (SC); verification occurs as to whether the access rights to said event are contained in the security unit (SC), if this is the case, a receipt (Q) is provided for all or part of the control message (ECM) by means of a secret key (K) which is contained in the security unit (SC) and is proper to each security unit; said receipt (Q) is stored on the storage unit.