In a few weeks, across the European Union, text written by ChatGPT will carry an invisible mark. You won't see it.

To read it, you need a key. And for now, that key is lent out on application.

European law imposed the mark. The companies keep the key, and only approved experts may apply for it.

In August, we looked at the mark of a first lab. This week, the second one adds its own: the same principle, but a very different map.

Meanwhile, AI is moving into your documents, fixing your sentences right inside your own file. So who wrote it, then?

And the newest model reaches every single account, free ones included, within a single day.

One word in ten: that's all you need to change for the mark to fade sharply.

And a metal wire in a sheet of paper, in Italy, more than seven centuries ago.

Three signals. One thread. One question…

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🔗 THE SOURCES, BY SIGNAL

Signal 1 - the mark and the key

• OpenAI - textGrain and the EU text provenance rules, 05/10

https://tinyurl.com/ym7drh4d

• BleepingComputer - invisible watermarks in ChatGPT and Codex text in the EU, 05/10

https://tinyurl.com/n4mrserh

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Signal 2 - two labs, two maps

• Anthropic - how Claude marks the content it generates

https://tinyurl.com/5bbffp53

• Claude - Claude in Google Docs, Sheets and Slides, 06/10

https://tinyurl.com/mr2ep7c4

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Signal 3 - the same model for everyone

• The Decoder - GPT-6 and its interactive answers in ChatGPT, 07/10

https://tinyurl.com/2aujdh3z

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🎧 SYNTHESISED FROM…

• Le Centre de gravité (French) - « textGrain : le filigrane IA peut-il prouver l'auteur ? », 07/10

https://tinyurl.com/ykyf2wcm

Also cited, without a link: Next, Blog du Modérateur and PCWorld (OpenAI's and Anthropic's detectors), the EU AI Act (Article 50), SynthAIcast episode 20 (Anthropic's mark), and for the history of the watermark, the Museum of Fine Arts, Boston (CAMEO).

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