Device for and a Method of Processing an Encrypted Data Stream in a Cryptographic System
    1.
    发明申请
    Device for and a Method of Processing an Encrypted Data Stream in a Cryptographic System 审中-公开
    在加密系统中处理加密数据流的装置和方法

    公开(公告)号:US20080212774A1

    公开(公告)日:2008-09-04

    申请号:US11912320

    申请日:2006-04-25

    IPC分类号: H04N7/167 H04L9/00

    摘要: A device (3200) for processing an encrypted data stream (3201) in a cryptographic system, in which decryption data (3204) are provided for decrypting each segment (3202) of the encrypted data stream (3201) for reproduction of the decrypted data stream, wherein the device (3200) comprises a first determining unit (3209) for determining, in case of switching from a first reproduction mode (1501) of reproducing the data stream (3201) to a second reproduction mode (1502) of reproducing the data stream (3201), a current position of reproduction within the data stream, and a second determining unit (3210) for determining a starting position for starting reproduction in the second reproduction mode (1502) based on the determined current position.

    摘要翻译: 一种用于处理加密系统中的加密数据流(3201)的装置(3200),其中提供解密数据(3204),用于对加密数据流(3201)的每个段(3202)进行解密,以再现解密的数据流 ,其中所述设备(3200)包括第一确定单元(3209),用于在从再现所述数据流(3201)的第一再现模式(1501)切换到再现所述数据的第二再现模式(1502)的情况下,确定 流(3201),数据流内的再现的当前位置,以及用于基于所确定的当前位置确定在第二再现模式(1502)中开始再现的起始位置的第二确定单元(3210)。

    Device for and a Method of Processing an Encrypted Data Stream
    3.
    发明申请
    Device for and a Method of Processing an Encrypted Data Stream 审中-公开
    设备和处理加密数据流的方法

    公开(公告)号:US20080170687A1

    公开(公告)日:2008-07-17

    申请号:US11912323

    申请日:2006-04-25

    IPC分类号: H04N7/167 H04L9/00

    摘要: A device (3000) for processing an encrypted data stream (3001), wherein decryption messages are provided for decrypting each segment (1403) of the encrypted data stream (3001), wherein each decryption message comprises a number of decryption elements, wherein the device (3000) comprises a detection unit (3002) for detecting the number of decryption elements per decryption message, and a determining unit (3003) for determining a position for providing the decryption messages in relation to the sequence of the segments (1403), based on the detected number.

    摘要翻译: 一种用于处理加密数据流(3001)的设备(3000),其中提供解密消息用于对加密数据流(3001)的每个段(1403)进行解密,其中每个解密消息包括多个解密元素,其中该设备 (3000)包括:检测单元(3002),用于检测每个解密消息的解密元素的数量;以及确定单元(3003),用于基于片段序列(1403)确定提供解密消息的位置, 检测到的数字。

    Method and apparatus for processing a stream that contains encrypted information
    4.
    发明申请
    Method and apparatus for processing a stream that contains encrypted information 审中-公开
    用于处理包含加密信息的流的方法和装置

    公开(公告)号:US20050207576A1

    公开(公告)日:2005-09-22

    申请号:US10517477

    申请日:2003-05-21

    摘要: Video information is transmitted encrypted as part of a video stream, so as to provide conditional access to the video information. The video stream comprising mutually interspersed first and second subsets of the image frames. The information for the image frames of the first subset is encrypted. A stream is broadcast (10) that contains, interspersed with one another, the information for the first subset in encrypted form and the information for the image frames of the second subset at least partly in plain form. This permits receivers (12) to detect the unencrypted parts without decryption and to generate and store pointer information (124) to the unencrypted parts. The pointer information can be used later for the purpose of trick play (126) at the receiver.

    摘要翻译: 视频信息作为视频流的一部分被加密地传送,以便为视频信息提供条件访问。 视频流包括图像帧的相互散布的第一和第二子集。 第一子集的图像帧的信息被加密。 广播流(10),其包含彼此散布的加密形式的第一子集的信息以及至少部分以简单形式的第二子集的图像帧的信息。 这允许接收器(12)在没有解密的情况下检测未加密的部分,并且生成并存储指向未加密部分的指针信息(124)。 指针信息可以稍后用于在接收机处进行特技播放(126)的目的。

    System for modifying the time-base of a video signal
    5.
    发明申请
    System for modifying the time-base of a video signal 失效
    用于修改视频信号时基的系统

    公开(公告)号:US20060078300A1

    公开(公告)日:2006-04-13

    申请号:US10538611

    申请日:2003-12-15

    IPC分类号: H04N5/95

    摘要: A storage device 500 includes an input 405 for receiving a digital video stream complying with a predetermined video encoding standard via a digital video communication system. The stream includes a sequence of digital video frames, a sequence of program clock reference stamps (PCR) and a sequence of video presentation time stamps (PTS). A time-base modifier 510 replaces the PTS's by respective modified video presentation time stamps (M-PTS) based on a constant predetermined frame time between successive presentation time stamps and replaces the PCR's by respective modified program clock reference stamps (M-PCR) by scaling the PCR's using a scaling factor that depends on a ratio of an expected time between a video presentation time stamp j and a preceding video presentation time stamp j−n and an actual time between the video presentation time stamp j and the preceding video presentation time stamp j−n, where j≧n>0. The expected time is n times the predetermined frame time.

    摘要翻译: 存储装置500包括用于经由数字视频通信系统接收符合预定视频编码标准的数字视频流的输入405。 流包括一系列数字视频帧,一系列程序时钟参考标记(PCR)和一系列的视频呈现时间戳(PTS)。 时基修饰符510基于连续呈现时间戳之间的恒定预定帧时间,通过相应修改的视频呈现时间戳(M-PTS)来替换PTS,并且通过相应的修改的程序时钟参考标记(M-PCR)由PCR替换PCR 使用取决于视频呈现时间戳j和之前的视频呈现时间戳jn之间的期望时间的比率的比例因子以及视频呈现时间戳j和之前的视频呈现时间戳jn之间的实际时间来缩放PCR ,其中j> = n> 0。 预期时间是预定帧时间的n倍。

    Trick play behavior controlled by a user
    6.
    发明申请
    Trick play behavior controlled by a user 审中-公开
    用户控制的特技游戏行为

    公开(公告)号:US20060039676A1

    公开(公告)日:2006-02-23

    申请号:US10522281

    申请日:2003-07-10

    IPC分类号: H04N5/783

    CPC分类号: H04N5/783 H04N9/8042

    摘要: A method and apparatus for providing user controlled implementation of trick play modes of operation of digital video data is disclosed. A user interface is provided on a video screen. The user is prompted to select a speed on the user interface at which the trick play mode will operate. The user is then prompted on the user interface to select how the selected speed is implemented. Alternatively, a list of possible implementations (predefined modes of operation) are displayed on the user interface from which the user can select the desired mode of operation.

    摘要翻译: 公开了一种用于提供数字视频数据的特技播放操作模式的用户控制实现的方法和装置。 在视频屏幕上提供用户界面。 提示用户在特技播放模式将要操作的用户界面上选择速度。 然后在用户界面上提示用户选择如何实现所选择的速度。 或者,可以在用户界面上显示可能的实现(预定义操作模式)的列表,用户可以从其中选择所需的操作模式。

    Conditional access system and apparatus
    7.
    发明申请
    Conditional access system and apparatus 审中-公开
    有条件的接入系统和设备

    公开(公告)号:US20050160040A1

    公开(公告)日:2005-07-21

    申请号:US10511366

    申请日:2003-04-03

    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。

    Method and apparatus for handling layered media data
    8.
    发明申请
    Method and apparatus for handling layered media data 审中-公开
    处理分层媒体数据的方法和装置

    公开(公告)号:US20060098937A1

    公开(公告)日:2006-05-11

    申请号:US10539971

    申请日:2003-12-01

    IPC分类号: H04N5/781

    摘要: A method and apparatus (100) for handling a layered digital video stream, comprising a base layer stream and an enhancement layer stream for providing HDTV, is disclosed. Either of the base layer stream or the enhancement layer stream is stored on a hard disc (101), and the other is stored on an optical disc by means of an optical disc drive (102). The streams are handled separately until they are utilized for providing HDTV. When the layered video stream is to be played back with HDTV quality, the base layer stream and the enhancement layer stream are synchronized by means of a synchronizer (106) for referring to the same frame. The synchronized streams are then decoded by means of a base decoder (105a) and an enhancement decoder (105b), which outputs decoded streams that are combined by an adder 112.

    摘要翻译: 公开了一种用于处理分层数字视频流的方法和装置(100),包括用于提供HDTV的基本层流和增强层流。 基本层流或增强层流中的任何一个存储在硬盘(101)上,另一个通过光盘驱动器(102)存储在光盘上。 流被分开处理,直到它们被用于提供HDTV。 当以HDTV质量回放分层视频流时,基本层流和增强层流通过用于引用同一帧的同步器(106)同步。 然后借助于基本解码器(105a)和增强解码器(105b)对同步流进行解码,该解码器输出由加法器112组合的解码流。

    Trick play of an encrypted video stream
    9.
    发明申请
    Trick play of an encrypted video stream 审中-公开
    加密视频流的特技播放

    公开(公告)号:US20060075440A1

    公开(公告)日:2006-04-06

    申请号:US10517478

    申请日:2003-06-11

    申请人: Albert Rijckaert

    发明人: Albert Rijckaert

    IPC分类号: H04N7/173

    摘要: A stream of video data is normally played in forward direction. Units of control word information required to decrypt successive segments of the stream are supplied synchronized to the stream. During reverse mode replay sections of the stream are replayed in reverse order. The units of control word information are resynchronized relative to supply of video information. Crossing of boundaries between segments during reverse mode replay triggers supply of selected units. The units are selected so that they contain the control word needed to decrypt a first segment that is normally previous to a second segment that ends at the boundary. Generally, this is a unit that normally starts to be supplied just before or after the start of the first segment.

    摘要翻译: 视频数据流通常以正向方向播放。 将数据流的连续段解密所需的控制字信息的单位同时提供给流。 在反向模式期间,流的重放部分以相反的顺序重播。 控制字信息的单位相对于视频信息的供给而重新同步。 在反向模式重播过程中跨越段之间的边界会触发所选单位的供应。 选择这些单元使得它们包含解密通常在结束于边界的第二段的先前的第一段所需的控制字。 通常,这是在第一段开始之前或之后通常开始提供的单元。

    Reproduction of a trick play signal
    10.
    发明申请
    Reproduction of a trick play signal 审中-公开
    复制特技播放信号

    公开(公告)号:US20070133942A1

    公开(公告)日:2007-06-14

    申请号:US10579417

    申请日:2004-11-10

    IPC分类号: H04N5/91

    摘要: A trick play signal is derived from a stored, and typically encrypted video stream. The video stream comprises data representing a series of I frames and P or B frames encoded at a variable bit rate, the I-frames being decodable independent of any other frame, decoding of the P or B frames requiring reference to other frames. Selected segments of data are retrieved from the video stream. Each segment corresponds to a part of data from the stream with a selected length. Distances between successive retrieved segments are selected dependent on a trick play speed. A trick play video signal is generated that comprises an earliest first frame from each respective segment. Stream specific properties of the stream are determined that are indicative of a rate at which the I-frames occur in the stream. The selected length for use in said selective retrieving is computed from the properties that have been determined, so that on the basis of the properties the segments of said selected length are predicted to include data representing at least one whole first frame at least on average.

    摘要翻译: 特技播放信号是从存储的,通常加密的视频流中导出的。 视频流包括表示一系列I帧和以可变比特率编码的P或B帧的数据,I帧可解码,独立于任何其他帧,需要引用其他帧的P或B帧的解码。 从视频流检索所选的数据段。 每个段对应于来自具有所选长度的流的一部分数据。 连续检索段之间的距离是根据特技播放速度来选择的。 产生包含来自每个相应段的最早的第一帧的特技播放视频信号。 确定流的流特定属性,其指示I帧在流中发生的速率。 用于所述选择性检索的所选择的长度是根据所确定的属性来计算的,使得基于属性,预测所述选定长度的段至少包括平均至少一个整个第一帧的数据。