Add a document password

One way to restrict access to a PDF is to add a Document Open password.

Important: There is no way to open the PDF if you forget the password.
  1. Click Secure on the toolbar, and choose Password Encryption.
  2. Select Require A Password To Open The Document, and type a case-sensitive password in the text box.

If the PDF already has security applied, you may need to supply the Permissions password that lets you change security settings.

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