A writer may copy text from ChatGPT, make a few changes and assume nobody will know it came from an AI system. OpenAI's latest text provenance technology is designed to make that assumption less safe, at least for eligible ChatGPT and Codex output in the European Union.
OpenAI says it is introducing an invisible watermark in eligible ChatGPT and Codex text in the EU in response to requirements under the EU AI Act. The watermark is not a visible label or a phrase saying "written by ChatGPT". Instead, it is a statistical signal built into the model's choice of words.