| 摘要 |
<p>The method involves receiving, through mobile equipments (EM1, EM2), cryptograms via a mobile communication network (NET2). Local keys are determined from the received cryptograms. A control message (ECM) is received, via a broadcast network (NET1), and decrypted, and a control word (CW`), obtained by the encryption of a control word (CW), is obtained. The former word is decrypted with the keys to obtain the word (CW). An encrypted digital audio/video data stream is decrypted with the word (CW).</p> |
