该方法实现简单，但存在缺陷：由于附加块信息不同于正常通信过程，恶意用户容易察觉通信具有密钥恢复功能，使用数据包过滤方法，就可以完全屏蔽密钥恢复功能。
The implementation is practical but with obvious disadvantage: the illegal user can easily notice the key recovery, and by data package filtering, the key recovery function can be screened.
传统的多方向插值方法对图像丢失块进行恢复时，在某些情况下由于受周围正确接收块内无关边界的影响而导致出现错误边界。
Conventional multi-directional interpolation method sometimes may cause some inaccurate edges when using it to restore lost blocks in a picture, because of unrelated edge in correctly received blocks.
然而，基于DCT的传统视频压缩方法由于在低比特率下出现块失真严重影响恢复视频质量。
Unfortunately, in these situations, the notorious blocking artifacts resulting from block DCT set a severe limit on the achievable bit-rate with acceptable quality.
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