By secret information- the watermark is embedded in the original data to verify the ownership of the data. This embedded watermark can be a piece of text, logos, serial number, and the watermark is usually not visible or can not detect, which is closely integrated with the original data and hide, and you can experience some of the source data does not destroy the value in use or the operation of the commercial value can be preserved.

使用频域LSB水印算法的鲁棒性分析_胡东.caj

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