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Collected live samples from three popular generators we lacked: - Ideogram tags its downloads with EXIF Make="Ideogram AI" (no C2PA, no SynthID, no imwatermark) -- the Make tag is its only signal. exif_generator only read Software/Artist/ImageDescription, so it missed this; now reads Make too. Real cameras put "Apple"/"Canon" in Make (no AI token), so this stays low-false-positive. 4 originals ingested. - Recraft (PNG export) and Krea hosting FLUX 2: downloads carry NO detectable signal -- no C2PA/EXIF/IPTC, and notably no imwatermark despite Krea running FLUX. identify correctly reports 'unknown'. Both ingested as neg fixtures. Lesson recorded in CLAUDE.md: the imwatermark detector fires only on pristine output from a pipeline that runs the encoder (diffusers default, official BFL), not from re-hosts (Krea/Stability) or re-encoded exports (Recraft/Canva). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>