If you often apply the same security settings to multiple PDFs, you can save your settings as a policy that you can apply to other PDFs. Security policies include the security method, encryption password, permission settings, etc.

To change or remove certificate protection, go to Protect > Secure Document > Security Properties, and then use the Security tab to select Change Settings… or No Protection. You can also remove the protection via Protect > Secure Document > Remove Security.

The advantage of securing documents with certificates is that authors can specify unique permissions for each person. To add certificate protection to a PDF, go to Protect > Secure Document > Certificate Protect.

A certificate that contains a public key and other identifying information is used to encrypt documents or to verify a digital signature. Only the corresponding private key can decrypt the document encrypted using the certificate.

You can add a password to a PDF to limit access and restrict certain features, such as printing, copying, and editing. This section explains how to remove passwords and security settings from a PDF.

You can add a password to a PDF to limit access and restrict certain features, such as printing, copying, and editing. This section explains how to modify passwords and security settings for a PDF.

You can add a password to a PDF to limit access and restrict certain features, such as printing, copying, and editing. This section explains how to add a password and set security settings for a PDF.

You can add a password to a PDF to limit access and restrict certain features, such as printing, copying, and editing. There are two kinds of passwords that could be applied to a PDF file: a Document Open password and a Permissions password.

Some PDF files may contain restrictions preventing actions such as printing, editing, copying, etc. To check if you have these permissions, go to File > Properties > Security, or Protect > Secure Document > Security Properties.

The Optional Database Connectivity plug-in is a JavaScript object inside Foxit PDF Editor, allowing you to connect to Windows ODBC (Open Database Connectivity) data sources.