The below procedure describes how to validate digital signatures in Adobe Reader 9. Digital signatures are also supported by other applications and earlier versions of Adobe, but the validation procedure may be different.

When opening a digitally signed document in Adobe, the application will display an Icon for the signature validation status.
For signatures that have not been validated, the icon for 'Validity Unknown' is displayed: Validity Unknown

The icon will be in the Signature Panel at the top of the document window.

PDF documents signed by a representative of DNV will contain embedded information to authenticate the signer. The validation in Adobe does however require that the recipient of the document accepts DNV as a trusted certificate1) issuer.

The procedure to accept DNV as a trusted certificate1) issuer is:

  1. Right click on the actual signature and choose 'Show Signature Properties'

    Signature Properties

  2. On the 'Summary' tab, choose 'Show Certificate'

    Show certificate

  3. Verify that there is a certification path named 'DNVRootCA'. This identifies DNV as the owner of the digital certificate that has been used when signing the document.

    Mark the certification path named 'DNVRootCA', click the 'Trust'-tab and then 'Add to Trusted Identities'.
    Answer 'OK' to any security question that follows.

    Trust tab

  4. Check the field for 'Use this certificate as a trusted root' and click 'OK' twice to close this and the next window.

    Import contact settings

  5. Click 'Validate Signature' to execute the validation.
    A signature that has been validated against a trusted certificate1) is indicated as: Signature valid

    Documents with multiple valid signatures will be displayed as: Signature valid- document updated

Once 'DNVRootCA' has been as a Trusted Identity, any subsequent documents with digital signatures from DNV will be validated automatically when opened.

The validation status of digital signatures can be viewed by either holding the cursor over the actual signature, by right-clicking on the signature and choosing 'Show signature properties' or through the Signatures panel at the left in the Adobe window:

Signature field

For questions, please contact us.

1) The term 'certificate' is in this context used to denote a digital certificate of identity (electronic ID or eID)

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