| 发明名称 |
CONDITIONAL ACCESS SYSTEM |
| 摘要 |
A conditional access system in which entitlement control messages (ECMs) containing the encryption keys used to encrypt a programme transmission, are sent to a set-top box over a secure communications channel separate from the channel used for transmission of the encrypted programme. |
| 申请公布号 |
WO03003587(A2) |
申请公布日期 |
2003.01.09 |
| 申请号 |
WO2002IB02469 |
申请日期 |
2002.06.27 |
| 申请人 |
NOKIA CORPORATION;NELGER, RICKARD;NIEMINEN, ARI |
发明人 |
NELGER, RICKARD;NIEMINEN, ARI |
| 分类号 |
H04B;H04B1/00;H04N7/16;H04N7/20;H04N21/266;H04N21/462;H04N21/4623;H04N21/6334 |
主分类号 |
H04B |
| 代理机构 |
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代理人 |
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