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Like PDF digital signatures, XML digital signatures ensure integrity, authentication, and non-repudiation in documents.
However, PDF signatures have multiple data verification states.
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.
These timestamps are compliant with the timestamp and revocation features described in Part 4 of ETSI 102 778 If the signature status is unknown or unverified, validate the signature manually to determine the problem and possible solution.
If the signature status is invalid, contact the signer about the problem.
panel displays information about each digital signature in the current document and the change history of the document since the first digital signature.
Each version is saved as append-only and the original cannot be modified.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.A digital ID is required to add the certifying digital signature.Acrobat provides users with the capability to add a document timestamp to a PDF without also requiring an identity-based signature. (See Configure a timestamp server.) A timestamp assures the authenticity and existence of a document at a particular time.
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Acrobat trusts all certificates for signing and certifying that chain up to a trust anchor.