Follow these steps to limit access to a PDF by setting passwords and by restricting certain features, such as printing and editing, how to put a password on a pdf document Adobe Acrobat. This document provides instructions for Acrobat DC and Acrobat 2017. If you’re using Acrobat XI, see Acrobat XI Help. You can limit access to a PDF by setting passwords and by restricting certain features, such as printing and editing.
However, you cannot prevent saving copies of a PDF. The copies have the same restrictions as the original PDF. Using a permissions password, you can restrict printing, editing, and copying content in the PDF. Recipients don’t need a password to open the document in Reader or Acrobat. They do need a password to change the restrictions you’ve set.
If the PDF is secured with both types of passwords, it can be opened with either password. However, only the permissions password allows the user to change the restricted features. Because of the added security, setting both types of passwords is often beneficial. For each keystroke, the password strength meter evaluates your password and indicates the password strength. Choose a version equal to or lower than the recipients’ version of Acrobat or Reader. It is important to choose a version compatible with the recipient’s version of Acrobat or Reader.
For example, Acrobat 7 cannot open a PDF encrypted for Acrobat X and later. AES encryption algorithm with a 128-bit key size. To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X And Later. Encrypts the document and the document metadata. If this option is selected, search engines cannot access the document metadata.