公开(公告)号：WO2005048603A1

公开(公告)日：2005-05-26

申请号：PCT/IB2004/052300

申请日：2004-11-04

Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V. ,  SCHIPPER, Robert ,  VAN DOMMELEN, Erwin, J.

Inventor： SCHIPPER, Robert ,  VAN DOMMELEN, Erwin, J.

IPC: H04N7/167

CPC classification number: H04N21/4181 ,  G06Q20/1235 ,  G06Q20/388 ,  G07F7/1008 ,  H04N21/2347 ,  H04N21/26606 ,  H04N21/4405 ,  H04N21/44236 ,  H04N21/4623

Abstract: A data stream contains content data that can be decrypted using control words. ECM messages that are included in the stream and contain the control words that is required for decrypting nearby content data. EMM messages contain management information for entitling selected stream receiving devices to decrypt content data from the data stream using control words from ECM messages. Further management information is included in at least some of the the ECM messages. The secure device detects the further management information when the control words are supplied and tests whether the further management information is targeted at the stream receiving device (12). If so the secure device indefinitely disables subsequent decryption of at least part of the stream in the stream receiving device (12). In one embodiment, the further management information is targeted by means of a specified condition on entitlement information stored in the secure device. The secure device tests whether any of it's entitlement information meets this condition and, if so, disables supply of valid control words.

Abstract translation: 数据流包含使用控制字解密的内容数据。 包含在流中并包含解密附近内容数据所需的控制字的ECM消息。 EMM消息包含管理信息，用于使用所选择的流接收设备从ECM消息中使用控制字从数据流中解密内容数据。 至少一些ECM消息中包含进一步的管理信息。 当提供控制字时，安全装置检测另外的管理信息，并测试进一步的管理信息是否针对流接收装置（12）。 如果是这样，则安全设备无限期地禁止流接收设备（12）中的流的至少部分的后续解密。 在一个实施例中，通过存储在安全设备中的授权信息的指定条件来定位另外的管理信息。 安全设备测试其任何授权信息是否符合此条件，如果是，则禁用有效控制字的提供。