A Copilot draft still leaves a trail.Microsoft signed the same code.
Microsoft signed the same Code of Practice as OpenAI and Google. Copilot runs on that stack. There is no Copilot essay that explains a text watermark the way Anthropic explained Claude. Treat the draft like other marked prose. The trail, if it is there, is in the words.
Reviewed by Can Balkaya
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Choose the surface, then the tool
| Surface | Gifi action | What can be verified |
|---|---|---|
| Ordinary words | Rewrite the prose | The words changed; no private detector certificate |
| C2PA, EXIF, XMP, properties | Strip named metadata | Action list plus an independent reinspection |
| Visible Gemini corner mark | Patch the selected area locally | The visible pixels changed; SynthID may remain |
| Embedded pixel marks, audio, or video | Not supported | No removal claim |
The law is public. The method is not.
Article 50 still applies. Copilot is not ChatGPT in a different window, and it is not a published SynthID-Text recipe. If both mark, they use different keys.
The draft and the document are different jobs
A rewrite changes the words. A Word or PowerPoint export can also carry author fields and a Content Credential. Those we can strip. The sentences on the page are not the metadata.
What this cannot promise
- A rewrite does not prove the text was never AI-assisted.
- No one outside the lab can certify their detector. The key is private.
- Invisible pixel-embedded watermarks, audio and video are out of scope.
Questions this usually raises
- Does Copilot watermark text?
- Microsoft signed the code. They have not published a Copilot method.
- Is Copilot the same as ChatGPT?
- Related stack. Different product. Different key.
- Can you clean a Copilot Word file?
- The metadata, yes. Not the sentences.
Primary sources
Copilot
Statistical signal? Rewrite the prose.
A Copilot mark, if it is in the words, needs different words. Hidden characters and C2PA need the file cleaner.