You can add all your trusted time stamp servers as well as certificates that issued your digital IDs to the Trusted Certificates list.

To add a trusted digital certificate to the Trust Certificates list, please do the following:

•  Right-click the digital signature, and choose Show Signature Properties.

•  In the Signature Properties dialog box, click Show Certificate.

•  In the Certificate Viewer dialog box, specify the trust level for the certificate in the Trust tab:

  ²  Use this certificate as a trusted root: Use the certificate as a trusted root, and trust all certificates issued by that certificate authority. Once you make a certificate a trust anchor, revocation checking will not be performed on it. 

  ²  Validating Signatures or Validating Certified Documents: Trust the certificate when validating signatures or certified documents.

• Click Add to Trusted Certificates, and confirm your operation. 

To add a trusted time stamp server to the Trusted Certificates list, please do the following:

•  If a time stamp is added to a digital signature, click Timestamp Properties (or Advanced Properties) in the lower left corner of the Signature Properties dialog box. If a time stamp is added in the document, right-click the timestamp signature in Digital Signature pane, and choose Show Signature Properties.

•  In the pop-up Timestamp Properties (or Advanced Signature Properties) dialog box or Signature Properties dialog box, click Show Certificate.

• In the Certificate Viewer dialog box, specify the trust level for the certificate in the Trust tab:

  ²  Use this certificate as a trusted root: Use the certificate as a trusted root, and trust all certificates issued by that certificate authority. Once you make a certificate a trust anchor, revocation checking will not be performed on it. 

  ²  Validating Signatures or Validating Certified Documents: Trust the certificate when validating signatures or certified documents.

• Click Add to Trusted Certificates, and confirm your operation.

To check all the trusted certificates, choose Protect > Sign & Certify > Trusted Certificates. In the Trust Certificates window, you can manage all the trusted certificates, including adding & exporting a certificate, viewing certificate details, deleting a certificate, and specifying the trust level for a certificate.