What does the painter mean when he says that it is forbidden to use drawings with sketch watermarks?

Explain that the picture is about watermark and cannot be used.

The painter said that it is forbidden to use pictures with draft watermarks. The meaning is clear, that is, pictures with watermarks cannot be used, and pictures with watermarks do not want to be used by others.

Watermark is secure. Digital watermarking can add some digital information to image, sound and video signals, and realize the functions of document authenticity identification and copyright protection.

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