Provenance Analyser
What can actually be proven about who wrote a piece of text.
Vendor watermark
Some providers now mark the text their models generate. Reading that mark requires a key only the vendor holds, so no third party can check it. This check exists, stays switched off, and will not guess.
Hidden characters
Invisible characters can be embedded in text to carry a payload. This reads them straight from the file, so a result here is a direct observation rather than an estimate. It also finds them when they arrive innocently, from a copy-paste or a PDF.
Writing style
Compares the writing against patterns learned from a large collection of human and machine-written text. Suggestive, never proof, and never allowed to stand in for the checks above.
In the meantime, the AI Detector covers the writing-style half of this and is open now.
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Obsecura