Maybe this is silly: what about zero-width spaces or other hidden characters? Add them in post-processing, and the response quality doesn't degrade (though rendering etc. might be wonky).
Yes, it is silly. Stripping these is about as trivial as removing "this post was written by Claude" appended in plaintext. You could make a clipboard monitor that does this as soon as you CTRL+C, it's a 1-shot prompt. Not to mention that these wonky Unicode chars will break in every other program.
Stripping Anthropic's watermarking, however, is more difficult - probably about 2 prompts.
But your average joe won't "setup custom clipboard monitor to auto clip out whitespace". That's why Gemini still include its logo into generated picture even if it's trivial to crop it out
Ok, sounds like a watermark of “this post was written by Claude” is sufficient then. Or don’t add any at all - the average joe is that Canadian politician whose speech included “here is a more natural-flowing version of that section that sounds more like legislative speech rather than a series of short points.”
The real problem is false positives. One false positives is enough to make the whole thing dangerous. The results can't really be acted upon without risking defamation. If you admit that you redistributed someone else's copyrighted work to an AI company that never forgets, it's an admission of distributing copyrighted works.
The law should have at the very least required offline validation tools that cannot track or retain a copy of the documents being checked.
