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公开(公告)号：US20060072611A1
公开(公告)日：2006-04-06
申请号：US10517479
申请日：2003-05-27
IPC分类号： H04J3/24
CPC分类号： H04N5/76 , H04N5/781 , H04N5/85 , H04N5/907 , H04N5/913 , H04N7/1675 , H04N9/8042 , H04N21/4325 , H04N21/4334 , H04N21/4623 , H04N21/8455 , H04N21/8456 , H04N2005/91364
摘要： A broadcast data stream that contains a stream of encrypted data and a stream of messages. Data in successive segments of the stream of encrypted data is decryptable with successive decryption information from the messages. The stream of encrypted data is stored upon reception. The items with decryption information for the encrypted data are stored independently retrievable from the stream. Additionally synchronization information is generated and stored to link respective points in the stored stream of encrypted data to respective ones of the items with decryption information. During replay of a stored part of the stream of encrypted data the items with decryption information for the points in said stored part are retrieved. The retrieved items with decryption information are combined with the stream during replay at times selected under control of the synchronization information. The stream is fed to a decoder and the decryption information is combined with the stream by feeding the decryption information to a secure device, which in response to the decryption information feeds control words to the decoder.
摘要翻译： 包含加密数据流和消息流的广播数据流。 加密数据流的连续段中的数据可利用来自消息的连续解密信息进行解密。 加密数据流在接收时存储。 具有用于加密数据的解密信息的项目可独立从流中检索。 此外，生成并存储同步信息，以将存储的加密数据流中的各个点链接到具有解密信息的各个项目。 在加密数据流的存储部分的重放期间，检索具有所述存储部分中的点的解密信息的项目。 具有解密信息的检索项目在重放期间与在同步信息的控制下选择的时间相结合。 流被提供给解码器，并且通过将解密信息馈送到安全装置将解密信息与流组合，安全装置响应于解密信息将控制字提供给解码器。
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公开(公告)号：US20050160040A1
公开(公告)日：2005-07-21
申请号：US10511366
申请日：2003-04-03
CPC分类号： H04N21/4623 , H04N7/165 , H04N7/1675 , H04N21/26606 , H04N2005/91364
摘要： A signal (24) that contains a stream of encrypted data and a plurality of individually identified streams (20, 22) of messages. Each of the streams (20, 22) of messages contains decryption information for decrypting a common part of the encrypted data. In a receiving and recording apparatus a mode selection unit (16) selects an operating mode from a plurality of modes including a live rendering mode and a replay mode for rendering the signal with a rendering unit (14) when received live and when replayed from storage respectively. A decoder (14) decrypts the encrypted data using a selectable one of the streams of messages. The decoder (14) selects the stream of messages dependent on the selected operating mode.
摘要翻译： 包含加密数据流和多个单独识别的消息流（20,22）的信号（24）。 消息的每个流（20,22）包含用于解密加密数据的公共部分的解密信息。 在接收和记录装置中，模式选择单元（16）从包括实时再现模式和重播模式的多种模式中选择操作模式，用于在存储时直接渲染具有渲染单元（14）的信号，并且当从存储器重放时 分别。 解码器（14）使用消息流中的可选择的一个解密加密的数据。 解码器（14）根据选择的操作模式选择消息流。
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公开(公告)号：US20060059508A1
公开(公告)日：2006-03-16
申请号：US10520313
申请日：2003-06-20
CPC分类号： H04N21/4181 , H04N7/163 , H04N7/1675 , H04N21/26606 , H04N21/4623 , H04N21/63345 , H04N2005/91364
摘要： A decoder decrypts data from the stream of data, using decryption control words. A secure device is coupled to the decoder to supply the control words. The secure device has a memory space for storing at least two items of entitlement information with associated authorization keys. The secure device has an input for receiving messages from the apparatus. The message contains information for example about the source of the stream. The secure device contains an execution unit that responds to the messages by selecting from among die at least two items, if stored, dependent on a content of the messages. The execution unit enables sending of the control words to the decoder subject to the presence and validity of the selected one of the items of entitlement information, after decryption of the control word with a decryption key associated with the selected one of the items.
摘要翻译： 解码器使用解密控制字从数据流解密数据。 安全装置耦合到解码器以提供控制字。 安全装置具有用于存储具有相关联的授权密钥的至少两个授权信息项的存储空间。 安全装置具有用于从装置接收消息的输入。 该消息包含有关流的来源的信息。 安全装置包含一个执行单元，该执行单元通过根据消息的内容从至少两个项目中进行选择（如果被存储）来响应消息。 执行单元使得在利用与所选项目中的一个相关联的解密密钥对控制字进行解密之后，控制字能够发送到解码器，取决于所选择的一个授权信息的存在和有效性。
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