Conditional entitlement processing for obtaining control word
    80.
    发明专利
    Conditional entitlement processing for obtaining control word 审中-公开
    用于获取控制字的条件执行处理

    公开(公告)号:JP2010213268A

    公开(公告)日:2010-09-24

    申请号:JP2010044403

    申请日:2010-03-01

    IPC分类号: H04L9/08 H04N7/16

    摘要: PROBLEM TO BE SOLVED: To provide an improved method and an improved receiver for obtaining a control word.
    SOLUTION: Two or more subkeys are obtained in a receiver. Each subkey is encrypted, under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically, at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. The present invention can be used in a conditional system, such as Pay-TV system.
    COPYRIGHT: (C)2010,JPO&INPIT

    摘要翻译: 要解决的问题:提供一种用于获得控制字的改进的方法和改进的接收机。

    解决方案:在接收机中获得两个或多个子密钥。 在授权消息中接收到的密钥的控制下,每个子密钥被加密,或者在授权消息中接收的种子的控制下进行变换。 解密或变换后,组合子项以获得控制字。 通常,授权消息中的至少一个是正授权消息,并且授权消息中的至少一个是负授权消息。 本发明可以用于诸如付费电视系统之类的条件系统中。 版权所有(C)2010,JPO&INPIT