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feat(identify): attribute Canva and BytePlus C2PA; fix BytePlus->Adobe mislabel

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Mining the local production corpus (25,725 imgs) surfaced two AI vendors signing
C2PA that the registry missed:
- Canva (Magic Media) signed "Canva" + trainedAlgorithmicMedia -> detected AI but
  no platform attributed (disproves the old "Canva exports strip C2PA" assumption).
- BytePlus (ByteDance international: Seedream/Seededit) signs "Byteplus Pte. Ltd.";
  the bare volcengine needle missed it, so its output was mis-attributed to "Adobe
  Firefly" via an incidental "Adobe XMP" string the fallback byte-scan picked up.

Adding both to C2PA_AI_VENDORS lets the clean manifest issuer attribute them
directly. Corpus re-run: 16 platform changes, all improvements (3 Adobe->ByteDance
fixes, 4 None/TC260->ByteDance, 9 None->Canva), 0 regressions. An attempted
signer-based attribution fallback was measured and dropped: it regressed 18 images
(friendly ByteDance label -> raw Chinese cert org; IPTC tool name pre-empted).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Victor Kuznetsov
2026-06-18 21:57:21 -07:00
co-authored by Claude Opus 4.8
parent be566e8868
commit d4d9429328
3 changed files with 29 additions and 2 deletions
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src/remove_ai_watermarks/noai/constants.py
+14
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@@ -122,6 +122,20 @@ C2PA_AI_VENDORS: tuple[C2paAiVendor, ...] = (
C2paAiVendor(
b"volcengine", "ByteDance (Volcano Engine)", "ByteDance (Doubao / Jimeng / Volcano Engine)", "ByteDance"
),
# ByteDance's international brand (BytePlus / Seedream / Seededit) signs its
# cert as "Byteplus Pte. Ltd." -- the bare ``volcengine`` needle misses it, so
# real BytePlus AI output was mis-attributed (an incidental "Adobe XMP" string
# in the file's XMP made it read "Adobe Firefly"). Adding the issuer means the
# clean manifest issuer matches "BytePlus (ByteDance)" directly. The platform
# string mirrors the volcengine row: both share the "ByteDance" needle, so the
# earlier row's label wins anyway -- they normalize together for clash
# detection. Verified on real signed files in production traffic, 2026-06-19.
C2paAiVendor(b"Byteplus", "BytePlus (ByteDance)", "ByteDance (Doubao / Jimeng / Volcano Engine)", "ByteDance"),
# Canva Magic Media signs AI-generated images as "Canva" with a generic
# c2pa-rs claim generator + trainedAlgorithmicMedia; without this entry the
# source read AI but no platform was attributed. Verified on real signed files
# in production traffic, 2026-06-19. Canva does not use SynthID.
C2paAiVendor(b"Canva", "Canva", "Canva (Magic Media)", "Canva"),
# Truepic is a C2PA signing authority, not an AI generator: no platform label,
# never asserts is_ai (the verdict comes from the digital-source-type).
C2paAiVendor(b"Truepic", "Truepic", None, None),