Anthropic is now watermarking content generated with Claude, and Morgan read the headlines the way a lot of working writers did: Is my client going to see a watermark on my work? Núria explains what is actually happening, starting with the EU AI Act transparency phase that took effect in August 2026, which requires AI-generated content shown to the public to be labeled, with a carve-out for content that has been sufficiently edited and quality-controlled by humans.
The watermark itself is not a visible stamp. It is a statistical pattern in word choice, the same approach Google has used with Gemini since 2024, and neither company has released a public tool that can read it. The watermark also cannot tell anyone how much human involvement went into a document. Heavy AI editing of a fully human draft can leave a watermark behind, and light AI use may leave none, so its presence or absence says much less than people assume. OpenAI, meanwhile, tried watermarking, dropped it after user backlash, and is expected to need something like it to comply with the EU rules.
From there the hosts get into the AI detector question that comes up at every conference. Most detectors are doing pattern recognition, not watermark reading, and they routinely flag formulaic writing, which includes scientific and medical writing, and prose by people writing in English as a second language. The one exception people keep naming is Pangram, which optimizes against false positives. The bigger question, they argue, is why you want to detect AI at all: catching deepfakes and unreviewed AI advice is a different problem from wanting a guarantee that a human stands behind the quality of the work. That is where client conversations, AI policies, and disclosure come in, including the medical communications companies that now hand contractors a Copilot license so the AI use stays inside their walls.
In this episode
- What triggered the watermarking decision: the EU AI Act’s transparency requirements
- The human-editing carve-out, and who the law is actually trying to protect
- How a statistical watermark works, and why nobody can read it yet
- Google’s head start: Gemini has been watermarked since 2024
- Why a watermark cannot measure human involvement in either direction
- OpenAI’s abandoned watermark and the user backlash behind it
- Why AI detectors flag scientific writing and second-language English
- Pangram, false positives, and optimizing for precision over recall
- The real question: what are you trying to find out when you test for AI?
- Client trust, AI policies, and disclosing your process
- Medcomms companies issuing Copilot licenses to keep confidential work contained
- What clients actually want: a guarantee of quality at the end
LINKS:
- Hosted by Nuria Negrão (nurianegrao.com) and Morgan Leafe (morganleafemd.com).
- Sign up for Nuria's newsletter: https://nurianegrao.kit.com/signup