Method of partially scrambling a data stream
    1.
    发明授权
    Method of partially scrambling a data stream 有权
    部分扰乱数据流的方法

    公开(公告)号:US07978852B2

    公开(公告)日:2011-07-12

    申请号:US10582762

    申请日:2004-07-26

    IPC分类号: H04N7/167

    摘要: A method of partially scrambling a data stream (6) including transport stream packets (7), each transport stream packet (7) having a header (8) and a payload (9), wherein a sequence of transport stream packets (7) has payloads carrying encoded data elements, arranged in units (15), includes: selecting transport stream packets (7) forming a subsequence of the sequence, and scrambling at least part of the payloads (9) of each transport stream packet (7) in the subsequence. The method further includes monitoring the payloads (9) of at least some of the transport stream packets (7) in the sequence for the presence of data (22) indicating a boundary between two subsequent units (15), and, for selected units (15), including at least one of the transport stream packets (7) carrying data forming part of the selected unit (15) in the sub-sequence.

    摘要翻译: 一种部分加扰数据流(6)的方法,包括传输流分组(7),具有报头(8)和有效载荷(9)的每个传输流分组(7),其中一系列传输流分组(7)具有 承载以单元(15)为单位的编码数据元素的有效载荷包括:选择形成该序列的子序列的传输流分组(7),以及对该传输流分组(7)的有效载荷(9)的至少部分进行加扰 后果。 该方法还包括监视序列中至少一些传输流分组(7)的有效载荷(9),用于存在指示两个后续单元(15)之间的边界的数据(22),并且对于所选择的单元( 15),包括在子序列中承载形成所选单元(15)的一部分的数据的传输流分组(7)中的至少一个。