Super encrypted storage and retrieval of media programs with smartcard generated keys

摘要

A method and apparatus for storing and retrieving program material for subsequent replay is disclosed. In summary, the present invention describes a system and method for storing and retrieving program material for subsequent replay. The method comprises the steps of accepting encrypted access control information and the program material encrypted according to a first (CW) encryption key, the access control information including a first (CW) encryption key and control data; decrypting the received access control information to produce the first (CW) encryption key; decrypting the program material using the first (CW) encryption key; re-encrypting the program material using according to a second encryption key (516); encrypting the second encryption key (516) according to a third encryption key (520) to produce a fourth encryption key (524); and providing the re-encrypted program material (518) and a fourth encryption key (524) for storage. The apparatus comprises a conditional access module (406), for accepting encrypted access control information and the program material encrypted according to a first (CW) encryption key, the encrypted access control information including the first (CW) encryption key and temporally-variant control data, the control access module comprising a first decryption module (508), for decrypting the access control information to produce the first (CW) encryption key; a first encryption module (522), for encrypting a second encryption key (516) with a third encryption key (52) to produce a fourth encryption key (524); and a second decryption module (532) for decrypting the fourth encryption key (524) to produce the second encryption key (516).