Watermarking can be used to identify a media buyer, for cultural and educational monitoring to determine the copyright royalties and to determine whether the raw data has been modified in some form.

• 水印能被持有者用于辨别媒体卖宾，用于文教监督，猜测版税和著息权，猜测原始数据是否以某栽步不天被变动功。