这是一张奇特的一块是你的所有权证明。
This is a fancy piece of paper that is proof of your ownership.
是货物所有权证明单据。
所有权证明者采用基于扩频的对称水印技术，在宿主信号中嵌入水印；
The ownership prover insert the watermark into the host signal using symmetric watermark technology based on spread spectrum.
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