Copy protection for high-definition baseband video

D. Barr
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Abstract

A copy protection (CP) system is proposed for transmission of high-definition (HD) baseband video signals among consumer electronic (CE) products in the home. An encryption technique adds fluctuating pseudo-random amplitude-offsets to the components of the video signal to be protected, thereby disrupting the entertainment value of intercepted signals. The decryption technique subtracts equivalent offsets regenerated by legitimate receiving devices, thereby restoring the signal. The value of each offset remains constant for the duration of each horizontal scan line so that simple analog voltage summing/differencing circuits can be used for encryption/decryption of analog video signals. The same simple encryption/decryption algorithms can be used for digital implementations to protect digital transmission. Arguments are presented regarding why a CP system for baseband HD video is needed to ensure forward compatible access to premium content by emerging categories of HD-capable CE products. Prototype hardware implementing the analog encryption/decryption techniques has been successfully demonstrated.
高清基带视频的复制保护
提出了一种用于家庭消费电子产品间高清基带视频信号传输的拷贝保护系统。一种加密技术将波动的伪随机幅度偏移添加到要保护的视频信号的组件中,从而破坏被截获信号的娱乐价值。解密技术减去合法接收设备产生的等效偏移量,从而恢复信号。每个偏移量的值在每个水平扫描线的持续时间内保持不变,因此简单的模拟电压求和/差分电路可以用于模拟视频信号的加密/解密。同样简单的加密/解密算法可以用于数字实现,以保护数字传输。关于为什么需要一个用于基带高清视频的CP系统,以确保能够通过新兴类别的高清CE产品向前兼容访问优质内容,提出了争论。实现模拟加密/解密技术的原型硬件已成功演示。
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