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Anthropic published a technical explainer on August 14 describing how it is embedding invisible, machine-readable watermarks in all text Claude produces, using a version of Google DeepMind's open-source SynthID-Text. The mark is being applied worldwide - not just in Europe - to satisfy EU AI Act transparency rules that took effect August 2. Anthropic is explicit that detecting the watermark only shows Claude was likely involved at some point, and cannot establish who actually wrote the text.
