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Content provenance and C2PA tools: what ten projects' docs say about signing, verifying and…
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What this guide covers
For editors, publishers and developers handling signed or AI-marked media. It sums up what ten projects' docs say about signing, verifying, labelling AI output and watermarks, with their stated limits. Documentation only: nothing was run, no file was verified, and no law or licence is interpreted.
More about this guide
Guide ID: art_01M6DPWJC7QKV6ZEAEH91J9YB8
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Guide title
Content provenance and C2PA tools: what ten projects' docs say about signing, verifying and watermarks
Coverage
For editors, publishers and developers handling signed or AI-marked media. It sums up what ten projects' docs say about signing, verifying, labelling AI output and watermarks, with their stated limits. Documentation only: nothing was run, no file was verified, and no law or licence is interpreted.
Useful starting points
- A valid signature or present manifest shows what was claimed and signed, not that the claim is true; a missing manifest or watermark says nothing about who made the media.
- Re-encoding, resizing, optimisers and CDN image transforms can invalidate a credential, because the signature covers the file's bytes.
- A test or development signing certificate gives a valid signature that public verifiers still report as untrusted.
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