公开(公告)号：US20040037422A1

公开(公告)日：2004-02-26

申请号：US10437177

申请日：2003-05-14

Applicant: France Telecom

Inventor： Yann Bodo ,  Nathalie Laurent ,  Christophe Laurent

IPC: H04N007/167

CPC classification number: G06T1/0085 ,  G06T2201/0052 ,  H04N7/1675 ,  H04N19/48 ,  H04N19/61 ,  H04N21/23476 ,  H04N21/44055 ,  H04N21/8358

Abstract: The invention relates in particular to a method of scrambling a video signal using an encryption key for controlling access to audiovisual information. The video signal is scrambled by applying a tattooing function to the video signal by using a marking key derived from the encryption key, the tattooing function including a parameter for regulating the amplitude of tattooing so as to enable the visibility of the tattooing in the video signal to be adjusted. The invention also provides a dual unscrambling method, and a system, an encoder, a decoder, a broadcast server, and a data medium for implementing said methods.

Abstract translation: 本发明具体涉及一种利用加密密钥加扰视频信号以控制对视听信息的访问的方法。 通过使用从加密密钥导出的标记密钥将纹身功能应用于视频信号来加扰视频信号，纹身功能包括用于调节纹身幅度的参数，以便使视频信号中的纹身可见度 要调整 本发明还提供了一种双重解扰方法，以及用于实现所述方法的系统，编码器，解码器，广播服务器和数据介质。