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CN101005356B 对加扰内容数据对象进行解扰的方法 失效 - 权利终止

对加扰内容数据对象进行解扰的方法
摘要：
在一种对加扰内容数据对象(50a-50j)进行解扰的方法中，通过在可至少部分来源于内容解扰密钥的密钥(40，46)下应用至少一个解密操作来对加扰内容数据对象(50a-50j)的至少一个片段进行解扰。从通过数据通信信道从条件访问子系统(3)接收的消息(33)中获得至少一个内容解扰密钥(37)。在相关的信道密钥(24，27)下对从消息(33)中的至少一个内容解扰密钥(37)中可获得的数据的至少一个密码进行解密，其中，所述密码中的每一个均携带在消息(33)中。第一密钥(24)用于建立每个信道密钥(24，27)。通过在可至少部分来源于第一密钥(24)的密钥(43)下应用进一步解密操作，对加扰内容数据对象(50a-50j)的至少一个片段进行解扰。
摘要（英）：

In a method of descrambling a scrambled content data object (50a-50j), at least a section of the scrambled content data object (50a-50j) is descrambled by applying at least one decryption operation under a key (40,46) at least partly derivable from a content descrambling key. At least one content descrambling key (37) is obtained from a message (33) received from a conditional access sub-system (3) over a data communication channel. At least one cryptogram of data obtainable from at least one content descrambling key (37) in the message (33), each of which cryptograms are carried in the message (33), is decrypted under an associated channel key (24,27). A first key (24) is used to establish each channel key (24,27). At least the section of the scrambled content data object (50a-50j) is descrambled by applying a further decryption operation under a key (43) at least partly derivable from the first key (24).

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