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Harden TrustMark detection with an official fixture

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Victor Kuznetsov
2026-08-09 21:08:09 -07:00
parent 370556ffe6
commit 353bc5f12c
11 changed files with 143 additions and 37 deletions
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docs/module-internals.md
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@@ -564,7 +564,13 @@ human-made verdict. `ai_source_kind` distinguishes fully generated content from
AI-enhanced composites when the source metadata provides that distinction.
TrustMark is reported as a watermark signal but does not by itself assert AI
origin because it can also protect human-authored content.
origin because it can also protect human-authored content. The decoder requests
binary mode, matching Adobe's Durable Content Credentials example, then requires
the same payload and schema after a quality-95 JPEG round-trip. Only Variant P
schemas 0-2 count as positives. Schema 3 is below the precision threshold: all
38 measured historical false-positive candidates used it, and six retained the
same false payload after re-encoding. The official Adobe Variant P schema-1
fixture in `data/fixtures/provenance/` is the positive regression control.
Regression coverage: