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/digital-marketing-pro:c2pa-metadata — Embed Content Authenticity Provenance · indranilbanerjee | DecimalAI

legalby indranilbanerjee

/digital-marketing-pro:c2pa-metadata — Embed Content Authenticity Provenance

indranilbanerjee/c2pa-metadata

Source indranilbanerjee/digital-marketing-pro ↗License MIT

Embed C2PA (Content Authenticity Initiative) provenance manifests in AI-generated marketing assets (image/video/audio/PDF).

SkillScore86Maintained

Automatic

Marketing & Content pack

Last verified 8/17/2026

What it changes

Passed 17 of 20 test cases with the skill, and 5 of 20 without it.

Without skill27%

With skill86%

Checks it passed that the model alone missed

maps the claim to algorithmicMedia
declines to invoke the asset metadata signing command
sets using_dev_cert to true in the json execution report

and 15 more in the full report

14 fixed5 passed either way2 still failing1 broke

Pass-rate lift: +59 pp
Tokens: +120%
Agent turns: 0%
Response time: -37%

Model gemini-3.6-flashMeasured 8/17/2026v1 · latest is v219 of 22 cases passed with skill · 20 comparable

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/indranilbanerjee-c2pa-metadata/SKILL.md https://app.decimal.ai/s/indranilbanerjee-c2pa-metadata/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add indranilbanerjee-c2pa-metadata, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/indranilbanerjee-c2pa-metadata/ and pins it in .decimal/skills.lock

decimalai skills add indranilbanerjee-c2pa-metadata

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/indranilbanerjee-c2pa-metadata/SKILL.md https://app.decimal.ai/s/indranilbanerjee-c2pa-metadata/SKILL.md

Raw file: /s/indranilbanerjee-c2pa-metadata/SKILL.md ↗ · machine-readable summary at /s/indranilbanerjee-c2pa-metadata.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 12

Prompt

Our broadcast team wants to attach Content Credentials to live video streams. What is the minimum C2PA specification version that introduced format support for live video and plain text documents?

What was checked, without and with the skill
Checked	Without skill	With skill
identifies Content Credentials 2.3 as the floor version introducing live video support	Missed	Passed

case-12 · gemini-3.6-flash · 8/17/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md148 linessingle file

/digital-marketing-pro:c2pa-metadata — Embed Content Authenticity Provenance

Purpose

Wraps scripts/embed-c2pa.py to add a C2PA (Coalition for Content Provenance and Authenticity) manifest to any AI-generated marketing asset. The manifest carries a machine-readable provenance trail (who generated it, what generator was used, what prompt produced it, when it was reviewed) plus a visible AI-generation claim in the IPTC digital-source-type vocabulary.

This is the technical mechanism brands use to comply with:

EU AI Act Article 50 (applicable 2 August 2026) — generative-AI marketing content must be marked in a machine-readable format using open, interoperable standards. C2PA is the emerging backbone. Penalty for non-compliance: up to €15 million or 3% global annual turnover.
NY synthetic-performer disclosure law (effective June 2026) — $1K–$5K per violation, $10K repeat; applies to synthetic influencers and AI-generated endorsements.
FTC May 2026 endorsement guidance — covers AI testimonials and synthetic creator content.
Australia Online Safety Act / UK Online Safety Act — emerging deepfake disclosure requirements.

The resulting asset can be inspected by any C2PA-aware viewer (Adobe Photoshop, Lightroom, Truepic, contentcredentials.org/verify).

C2PA spec versions to be aware of (June 2026)

Content Credentials 2.3 (released 9 February 2026 — launch post) added format support for: live video (broadcast/streaming), plain text documents, OGG Vorbis audio, large AVI video files, and EXIF Original Preservation Images. If a brand is signing live-stream video or text-based assets for the first time, 2.3 is the floor version to target.
C2PA Spec 2.4 (April 2026 — spec.c2pa.org/specifications/specifications/2.4) introduces the AI Disclosure Assertion (c2pa.ai-disclosure) for machine-readable AI transparency info — this is the assertion the EU AI Act Article 50 deployer pathway will rely on. The final Code of Practice on Transparency of AI-Generated Content (published 10 June 2026) references C2PA-style assertions as the canonical machine-readable marking mechanism for both providers and deployers. See skills/context-engine/eu-code-of-practice.md for the full Article 50 context.
The C2PA Trust List is now handled via the public C2PA Conformance Program (any CA meeting the Certificate Policy can join). Production signing certificates should come from a Conformance-Program-listed CA, not an ad-hoc cert.

For DMP outputs: embed-c2pa.py now supports --ai-disclosure. Pass it to embed the C2PA 2.4 c2pa.ai-disclosure assertion alongside the existing IPTC digital-source-type claim. The combination gives you both human-readable (IPTC) and machine-readable (c2pa.ai-disclosure) EU AI Act Article 50 signaling — this is the deployer-side machine-readable pathway the final Code of Practice (10 June 2026) points to as the canonical marking mechanism. See skills/context-engine/eu-code-of-practice.md for the full Article 50 context.

When to invoke

Right after any AI image / video / audio generation step in the engagement workflow (Part 11 — AI Creative Instructions output)
Before handing a generated asset to the design team for review
As a pre-publish gate in /digital-marketing-pro:check for EU-targeted assets
Bulk-applying to a backlog of AI-generated assets before EU AI Act enforcement on 2 Aug 2026

Quick examples

# Single asset — image generated by Vertex AI / Nano Banana Pro
/digital-marketing-pro:c2pa-metadata \
    --input assets/q3-launch-hero.png \
    --output assets/signed/q3-launch-hero.png \
    --brand "Acme Corp" \
    --generator "Vertex AI / Nano Banana Pro" \
    --ai-claim ai-generated-content \

Track record

Benchmark

17 / 20

test cases passed, vs 5 / 20 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v6 — 10/17/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

indranilbanerjee / digital-marketing-pro

skills/c2pa-metadata/SKILL.md

View on GitHub ↗

License MITImported 10/17/2026Version v2

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

/digital-marketing-pro:c2pa-metadata — Embed Content Authenticity Provenance

Purpose

C2PA spec versions to be aware of (June 2026)

When to invoke

Quick examples

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills