Secure PDF files

When you need to protect access to or usage of your documents, it's time to utilize PDF security. PDF security is set on the document level, meaning that it applies to the entire document.

The stated purpose of security is to protect the document from unauthorized access or editing. The key word here is unauthorized - the document content is valuable enough to control access to it, but authorized people need to be able to read it when required. Nitro PDF Professional offers two options to handle this scenario:

1. Based around passwords, where authorized users enter a password each time they need to view or modify the document. Access is controlled by restricting access to the appropriate passwords.
2. A more automated form, based around certificates. Certificates serve as independent verification of the identity of the user. In order to use this method, you must have access to a valid digital ID. Whereas password security allows access to people with the appropriate password, certificate-based security only gives access to those with a pre-approved digital ID.

Related info: Nitro Pro 5 Help

How to secure and lock PDF files
Adding password security to PDF files
Adding certificate security to PDF files