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Alternatively, they add certificates directly from signatures in signed documents and then set trust levels.However, enterprises often require employees to validate the signatures of others without performing any manual task.You can change the trust settings of certificates to allow specific actions.For example, you can change the settings to enable the dynamic content and embedded Java Script within the certified document.Like PDF digital signatures, XML digital signatures ensure integrity, authentication, and non-repudiation in documents.However, PDF signatures have multiple data verification states.Signature validity is determined by checking the authenticity of the signature’s digital ID certificate status and document integrity: In Acrobat or Reader, the signature of a certified or signed document is valid if you and the signer have a trust relationship.
End users often exchange certificates as needed when using certificate security.
For more information about signature warnings and valid and invalid signatures, see the Each time a document is signed using a certificate, a signed version of the PDF at that time is saved with the PDF.
Each version is saved as append-only and the original cannot be modified.
You also specify the types of changes that are permitted for the document to remain certified.
For example, suppose that a government agency creates a form with signature fields.
Verification details are listed beneath each signature and can be viewed by expanding the signature. This feature analyzes the document for content that may alter the appearance of the document.