Manage Trusted Contacts
With Nitro Pro, you can add people to your Trusted Contacts by importing their public key certificate manually, or you can share your public key and their public key at the same time with the Request Contacts feature. You need to have the public key of a contact in Trusted Contacts to be able to validate any PDF files they have digitally signed.
Manage Digital IDs
A Digital ID is a security pass that allows you to create a digital identity, or to view a document that has been encrypted to prevent unauthorized access. You can create different Digital IDs for different tasks. For example, you can have a digital ID for opening accounting documents, and another one to open technical reports.
A digital ID is much like paper-based identification such as a passport. It can prove who you are and give you special rights to do particular things. In Nitro Pro, your digital ID can let you make your PDF files tamper-proof, as well as give you special access to files from users who have approved your digital ID. When you secure a document, you can change access and usage rights on a user-by-user basis.