When you receive certificates from others, you can add them to your list of trusted identities and set them as trusted roots. There are two ways to store certificates in your list of trusted identities: 1) import an existing certificate or 2) add a certificate from a digital signature in a signed PDF document. The list of trusted identities helps you validate the signatures of the users on any documents you receive from them.

Import an existing certificate

  1. Open a PDF and choose Security > Digital ID and Certificates > Trusted Identities.

  2. In the Manage Trusted Identities dialog box, click Add….

  3. In the Open dialog box, select the certificate to use and click Open.

  4. To set a certificate as a trusted identity in any documents, select a certificate and click Set as a Trusted Root.

Add a certificate from a digital signature in a signed PDF

You can directly add a certificate from a signed PDF document to your list of trusted identities.

  1. Open a PDF that contains digital signatures.

  2. Do any of the following to open the Signature Properties dialog box:

    • In the Signatures panel, right-click on the signature and select Properties….

    • Right-click on a signature field on your page and select Properties….

    • In the Signatures panel, click the Signatures Panel Options button and select Properties… from the menu.

  1. In the Signature Properties dialog box, click the General In the Additional Information section, click Verify Identity….

  2. In the Verify Identity dialog box, click Add as a Trusted Root to store the certificate of the digital signature in your list of trusted identities, making signatures of the user valid on any documents.

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