发明名称 |
METHOD FOR TRANSMISSION OF DIGITAL DATA TO A GROUP OF TARGET RECEIVER TERMINALS |
摘要 |
<p>This invention relates to a method for broadcasting digital data to a targeted set of reception terminals in which said data are previously scrambled by a series of control words transmitted in a conditional access control message. This method comprises the following steps: on transmission, particularise said access control message using a reversible function F for which the inverse function F−1 is executable only in terminals in the targeted set, and on reception, redetermine the original access control message in each terminal in the targeted set using said inverse function.</p> |
申请公布号 |
EP1749401(A1) |
申请公布日期 |
2007.02.07 |
申请号 |
EP20050766645 |
申请日期 |
2005.05.24 |
申请人 |
VIACCESS |
发明人 |
BEUN, FREDERIC;BOUDIER, LAURENCE;ROQUE, PIERRE;TRONEL, BRUNO |
分类号 |
H04N5/00;H04N7/16;H04N7/167 |
主分类号 |
H04N5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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