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Anthropic says text watermarking scheme relies on inconsequential words - The Register
Anthropic disclosed that its text watermarking technique operates by subtly altering low-impact, functionally redundant words — not core semantic content — to embed detectable signals without affecting meaning.
Aug 15, 2026
How Claude's text watermarking works - Anthropic
Anthropic has implemented an invisible text watermark in Claude-generated outputs to signal AI origin, prompting user backlash and subscription cancellations.
Aug 15, 2026
Making Open-Source Text LLM Watermarks Durable Against Merging
Researchers propose 'Merge-Adversarial Training' to make watermarks embedded in open-source LLMs resistant to model merging—a common post-training modification that previously erased such watermarks.
Jul 24, 2026