PDF glossary
X.509 certificate
A file that binds a public key to an identity, signed by whoever vouches for it — the standard certificate format behind digital signatures.
A certificate names its subject (a person or organisation), carries their public key, and is signed by an issuer. A certificate authority vouches for others; a self-signed certificate vouches only for itself.
In PDF-SDK
A digital ID created on the device comes with a self-signed X.509 certificate; for certificate-authority-backed signatures, plug in your own signer.
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