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An image containing text or a logo superimposed on top of the image. Typically to identify the owner/creator of the work, prevent the image from being counterfeited and/or impede AI training. Some watermarks are also deliberately placed as a "paywall" on "samples" of "paid reward" images.
Posts with watermarks added by third-parties (anyone other than the artist) should not be uploaded.
Add watermark grid if it spans over a majority/the whole image. Add too many watermarks if it's in excess as to be noticeable from the thumbnail.
See also
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