A hidden pattern in AI writing that software can spot later.
It is like invisible ink in a school essay. Your eyes see normal words. A scanner sees a tiny robot stamp.
Platforms can use it to spot AI text. Rewriting or translating can make the stamp fade.
Content provenance
A watermark is a machine-readable clue about where content came from.
AI detector
An AI detector can use a watermark to spot machine-written text.
EU AI Act
The EU AI Act pushes AI text to include machine-readable markers.