Method for protecting a saved multimedia content, in which: - a network headend transmits a scrambled multimedia content and ECM (Entitlement Control Message) messages containing cryptograms CW* of control words CW each making it possible to descramble a respective cryptoperiod of the scrambled multimedia content, - a recorder receives the scrambled multimedia content and the ECM messages, decrypts the cryptograms CW* contained in the ECM messages received with a subscription key K a and read-protects the scrambled multimedia content using a local key KH k by encrypting, with the local key KH k, the decrypted control words to generate cryptograms CW KHk, - the recorder saves the scrambled multimedia content and the cryptograms CW KHk, in which the method also comprises: - the provision (152, 154) of a table associating, with a home identifier • the recorder, and • a group of M distinct readers chosen from among a set of N readers capable of decrypting, when they have received the local key KH k, the cryptograms CW KHk, then of descrambling the saved multimedia content with the control words CW thus decrypted to read the multimedia content in clear, in which M is an integer number greater than or equal to two and strictly less than N, and - a step in which the network headend transmits the key KH k to the readers which are associated with the same home identifier in the table and does not transmit the key KH k to the readers which are not associated with this home identifier in this table, characterized in that the step in which the network headend transmits the key KHk to the readers proceeds in two substeps: • a substep in which the network headend transmits to the recorder, for each reader of the group of M readers, a cryptogram KH k Ki obtained by encrypting the local key KH k with a key K i known only to the ith reader of the group of M readers out of the set of the N readers, • a substep in which, in response to a request to read the multimedia content by the ith reader, the recorder transmits to this reader the cryptogram KH k Ki, and the ith reader decrypts the cryptogram KH k Ki with its key K i to obtain the local key KH k making it possible to descramble the saved multimedia content. - a network headend transmits a scrambled multimedia content and ECM (Entitlement Control Message) messages containing cryptograms CW* of control words CW each making it possible to descramble a respective cryptoperiod of the scrambled multimedia content, - a recorder receives the scrambled multimedia content and the ECM messages, decrypts the cryptograms CW* contained in the ECM messages received with a subscription key K a and read-protects the scrambled multimedia content using a local key KH k by encrypting, with the local key KH k, the decrypted control words to generate cryptograms CW KHk, - the recorder saves the scrambled multimedia content and the cryptograms CW KHk, - the provision (152, 154) of a table associating, with a home identifier • the recorder, and • a group of M distinct readers chosen from among a set of N readers capable of decrypting, when they have received the local key KH k, the cryptograms CW KHk, then of descrambling the saved multimedia content with the control words CW thus decrypted to read the multimedia content in clear, in which M is an integer number greater than or equal to two and strictly less than N, and • the recorder, and • a group of M distinct readers chosen from among a set of N readers capable of decrypting, when they have received the local key KH k, the cryptograms CW KHk, then of descrambling the saved multimedia content with the control words CW thus decrypted to read the multimedia content in clear, in which M is an integer number greater than or equal to two and strictly less than N, and - a step in which the network headend transmits the key KH k to the readers which are associated with the same home identifier in the table and does not transmit the key KH k to the readers which are not associated with this home identifier in this table, • a substep in which the network headend transmits to the recorder, for each reader of the group of M readers, a cryptogram KH k Ki obtained by encrypting the local key KH k with a key K i known only to the ith reader of the group of M readers out of the set of the N readers, • a substep in which, in response to a request to read the multimedia content by the ith reader, the recorder transmits to this reader the cryptogram KH k Ki, and the ith reader decrypts the cryptogram KH k Ki with its key K i to obtain the local key KH k making it possible to descramble the saved multimedia content.