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C2PA SDK (Content Authenticity Initiative)

Content Authenticity Initiative
open source / Overall score: 3.6

The Content Authenticity Initiative's open-source SDK for C2PA Content Credentials: it writes, signs and validates the cryptographically signed manifests that record where a piece of media came from and how it was edited. The core is a Rust library, with Python bindings and a command-line tool built on it.

The Rust library and its Python bindings are treated as one product. Tagged independently verifiable: a reader validates the manifest's signature against a trust list.

Openness

5 high confidence
5.0
license
Apache-2.0/MIT(dual-licensed at the recipient's choice, in both repositories)
source
public
core features withheld
no

The Rust library and the Python bindings are each dual-licensed under MIT or Apache-2.0 at the user's choice, and the published code is the whole SDK. Content Credentials are an open standard, and nothing in the repositories is held back for a paid edition.

Adoption

3 high confidence
3.0

Downloads of the two packages the SDK ships through, the c2pa-python bindings on PyPI and the c2pa crate on crates.io, measure its use.

Capability

4 high confidence
4.0

A manifest is signed, so anyone holding the file can check that it was not altered and which certificate signed it, offline and without the publisher's help. What it cannot show is that the signer's claims about the content are true, which is the gap between this and NVIDIA's hardware attestation.

Verified 2026-09-26