Anthropic's watermarking technique is possible, and worryingly could effect low frequency choices (eg as I said, with object placement or style). However, this

Anthropic's watermarking technique is possible, and worryingly could effect low frequency choices (eg as I said, with object placement or style). However, this has to be a generation time decision, you can't really do that with a small edit. In fact small edits tend to be detectable spectrally.