发明授权
EP1374586B1 SYSTEME ET PROCEDE DE TRANSMISSION D'INFORMATIONS CHIFFREES A CLE CHIFFREE
有权
设备和方法使用加密密钥加密的数据传输
- 专利标题： SYSTEME ET PROCEDE DE TRANSMISSION D'INFORMATIONS CHIFFREES A CLE CHIFFREE
- 专利标题（英）： System and method for transmitting encrypted data with encryption key
- 专利标题（中）： 设备和方法使用加密密钥加密的数据传输
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申请号： EP02722363.5申请日： 2002-03-22
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公开(公告)号： EP1374586B1公开(公告)日： 2008-05-07
- 发明人: DAUVOIS, Jean-Luc , MAILLARD, Michel
- 申请人： Nagra Thomson Licensing
- 申请人地址： 46, Quai Alphonse Le Gallo 92100 Boulogne-Billancourt FR
- 专利权人： Nagra Thomson Licensing
- 当前专利权人： Nagra Thomson Licensing
- 当前专利权人地址： 46, Quai Alphonse Le Gallo 92100 Boulogne-Billancourt FR
- 代理机构： Wenger, Joel-Théophile
- 优先权： FR0104342 20010330
- 国际公布： WO2002080544 20021010
- 主分类号： H04N7/16
- IPC分类号： H04N7/16 ; H04N7/167
摘要：
The invention concerns a method for data transmission between a transmitting station (100e) and a plurality of receiving stations (100r) which consists in transmitting from the transmitting station to the receiving stations data encrypted with a first key, and at least a control message transporting a second key. The invention is characterised in that the first key, used for decrypting, is recovered in each receiving station from the second key and from at least a data selected among the set of data available in the receiving stations, based on a selection command periodically transmitted between the transmitting station and the receiving station. The invention is applicable to pay television. FIG. 2: 104e, 114e, 116e, 122e, 124e ENCRYPTION UNITS 104r, 114r, 116r, 122r, 124r DECRYPTION UNITS A ENCODING KEY B ENTITLEMENT CONTROL MESSAGE C ENTITLEMENT MANAGEMENT MESSAGE D OPERATING KEY E CLIENT KEY S COMMAND MESSAGE
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