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Victor Kuznetsov 95f467b4ad Register the Doubao video mark with a corpus-calibrated single-floor policy

detect_doubao_frame reuses the image engine's synthetic doubao alpha as its
video template, so the glyph cannot drift between registries. The policy is
seedance-style single-floor, calibrated by sequential decode over 39
TC260-confirmed Doubao corpus videos and 25 negatives: a 12-frame stable run
at 0.35 accepts 33/39 positives and 0/25 negatives (0.30 already accepted a
negative), and through the shipped arbiter identify_video selects 32/39 with
no false selection. Also documents the measured impossibility of a bare-pill
removal arm with the current detector (68 OCR-confirmed pills max 0.317 vs
clean negatives max 0.353 -- no separating threshold exists).

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provenance

Harden TrustMark detection with an official fixture

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visible

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README.md

Harden TrustMark detection with an official fixture

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README.md

Provenance fixtures

These files exercise real container, metadata, and pixel-provenance formats. They are test inputs, not evaluation corpora.

Adobe TrustMark

adobe-trustmark-p.png is Adobe's official images/ghost_P.png Variant P example from adobe/trustmark at commit 0ed40cbe8188f664fd9cbbeacd969807de27440a.

Source: https://raw.githubusercontent.com/adobe/trustmark/0ed40cbe8188f664fd9cbbeacd969807de27440a/images/ghost_P.png
SHA-256: e58c5825ed7e5d9fb04710ea541b61bd55879cad65554c0d46260aa24b3d0755
Expected signal: TrustMark Variant P, schema 1
License: MIT, reproduced in ../licenses/adobe-trustmark-MIT.txt