We can certify whether a document was created or signed before a given time with a digital time stamp.

人们可以利用安全数字时间戳来证明在某一给定的时间之前某一数字文档是否被创建或者签名。

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The TV stations embed digital time stamp on the screen.

电视台会把数字时钟嵌入在屏幕上。

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The TV stations embed digital time stamp on the screen.

电视台会把数字时钟嵌入在屏幕上。

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