公开(公告)号：EP1418701A1

公开(公告)日：2004-05-12

申请号：EP02257788.6

申请日：2002-11-11

Applicant: STMicroelectronics, Ltd.

Inventor： Dellow, Andrew Dellow ,  Cordero, Rodrigo

IPC: H04L9/08 ,  H04N7/167

CPC classification number: H04N21/4181 ,  G06F21/602 ,  H04L9/083 ,  H04L9/0894 ,  H04L2209/60 ,  H04N7/163 ,  H04N7/1675 ,  H04N21/63345

Abstract: A semiconductor circuit for use in a system for receiving and decrypting broadcast signals such as pay television comprises an input and stores for receiving a decryption key in two portions named mother and daughter portion. The splitting of the key into two portions allows a common main or mother portion to be sent broadcast to a large number of subscribers and for separate daughter portions to be sent to each subscriber or group of subscribers depending upon, for example, entitlements for which the subscribers have paid. The semiconductor circuit is arranged to retrieve the mother portion and a relevant daughter portion to construct a complete decryption key.

Abstract translation: 在用于接收和解密诸如付费电视之类的广播信号的系统中的半导体电路包括一个输入和存储，用于接收两部分称为母子部分的解密密钥。 将密钥分成两部分允许将普通主或母部分发送到大量订户，并且将单独的子部分发送到每个订户或订户组，这取决于例如， 用户已付款。 半导体电路被布置成检索母部分和相关的子部分以构建完整的解密密钥。