The system of preemption is a all-important system of civil law, it upset the principle of equal authorization, and behave as a sort of democratic prerogative.
优先购买权制度是民法上一项十分重要的制度，它打破了民法平等赋权的原则，表现为一种民事特权。
Watermarking is a new information hiding technology. Its principle is embedding the copyright authorization information into the under-protection media like image, audio or video.
数字水印技术是一种新型的信息隐藏技术，它的主要思想是在数字视频、音频和图像媒体中加入保护数字产品的版权证明。
Watermarking is a new information hiding technology. Its principle is embedding the copyright authorization information into the under-protection media like image, audio or video.
数字水印技术是一种新型的信息隐藏技术，它的主要思想是在数字视频、音频和图像媒体中加入保护数字产品的版权证明。
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