You can add trusted certificates to a list so that Infix Pro PDF Editor knows about them in future. You should only do this when you are sure of the provenance of a certificate.

To mark a certificate as 'trusted':

  • Click on the certificate in the Signature panel (View->Signatures) then press Add 
  • Open the Manage Trusted Signatures dialog box (Edit->Signatures->Manage Trusted Certificates) then press Add.

Trusted Certificate Lists

Infix Pro PDF Editor uses publicly available lists of trusted certificates to help it know when a signed PDF may be a cause for concern. To ensure you have the latest information on which certificates can be trusted you should occasionally update your copy of the lists.

Updating the public list of trusted certificates
  1. Choose Edit->Signature->Manage Trusted Certificates...
  2. Press Update now