What I’m saying is that if someone just types verbatim what Claude says, instead of just going “Ctrl-C, Ctrl-V”, that completely undermines this whole thing.
Their point is that Claude is now engineering its responses to specifically conform to a detectable pattern, something that can of course be easily removed via a seperate LLM.
I dont think, he’s not hiding any invisible stuff in ASCII, it’s not technically possible. But the pattern can itself be a watermark like the person before me just said
You seem to be assuming that they’ll be embedding hidden characters or something. That is not the case; the watermarking will be based around West specific words are chosen, meaning that if you type in those exact words, you’ll likely preserve the watermark. There are more details here: https://www.explainx.ai/blog/anthropic-claude-invisible-watermarks-c2pa-august-2026
It’s some kind of statistical thing about what word is where, what character is there how often. Typing won’t help, but a rewrite will.
That was the author’s guess. Seems like this would only be detectable if it’s being used in enough text (possibly across multiple files).
What I’m saying is that if someone just types verbatim what Claude says, instead of just going “Ctrl-C, Ctrl-V”, that completely undermines this whole thing.
Their point is that Claude is now engineering its responses to specifically conform to a detectable pattern, something that can of course be easily removed via a seperate LLM.
I dont think, he’s not hiding any invisible stuff in ASCII, it’s not technically possible. But the pattern can itself be a watermark like the person before me just said
You seem to be assuming that they’ll be embedding hidden characters or something. That is not the case; the watermarking will be based around West specific words are chosen, meaning that if you type in those exact words, you’ll likely preserve the watermark. There are more details here: https://www.explainx.ai/blog/anthropic-claude-invisible-watermarks-c2pa-august-2026
Very interesting read, thanks for sharing.