watermark
a hidden signal in content that software can detect
A digital watermark is information embedded in a picture, video, audio clip or text. People usually cannot notice it, but software can read it. For AI content, a watermark lets a detection tool confirm the content was AI-generated. Good watermarks survive common edits such as cropping or compression.
Think of it as
Like the hidden security thread in a banknote that a scanner can check.
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