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Acrobat trusts all certificates for signing and certifying that chain up to a trust anchor.
Therefore, administrators should preconfigure client installations or let their end users add a trust anchor or anchors.
For more information on trusting certificates, see About certificate-based signatures.
Acrobat and Reader support XML data signatures that are used to sign data in XML Forms Architectures (XFA) forms.
The feature lets you find out if the document contains any dynamic content or external dependencies.
You can apply a certifying signature only if the PDF doesn’t already contain any other signatures. A blue ribbon icon in the Signatures panel indicates a valid certifying signature.When you receive a signed document, you may want to validate its signature(s) to verify the signer and the signed content.Depending on how you have configured your application, validation may occur automatically.All digital signatures and their corresponding versions can be accessed from the and manually setting its trust level.End users often exchange certificates as needed when using certificate security.
Alternatively, they add certificates directly from signatures in signed documents and then set trust levels.