Method and system for access control of audio/video data
摘要
<p>The processing unit has a deciphering unit receiving audio/video data and deciphering the data with an aid of control-word. The deciphered data is encrypted by an encryption unit (EC) with a common encryption key (Ki). The stored data is forwarded towards a decryption unit that deciphers the data under control of a security module (SM).The security module transmits the common key with the control word. An independent claim is also included for an access control method to digital audio/video data.</p>
申请公布号
EP1662788(A1)
申请公布日期
2006.05.31
申请号
EP20040106029
申请日期
2004.11.24
申请人
NAGRAVISION SA
发明人
HILL, M. MICHAEL JOHN;NICOULIN, M. ANDRE;GREMAUD, M. FABIEN;PUIATTI, M. JEAN-MICHEL;FISCHER, M. NICOLAS;MOREILLON, M. GUY