If you're having trouble setting a password for editing vs. viewing. Then you can use SameTools PDF Pro Software. Setting a password is used to stop others from opening the PDF without permission. An editing password allows users to view the file but blocks actions like editing, copying, or printing. When setting a password, make sure to check the right options, set the open password if you want to protect the file from being opened, and set the permissions password if you only want to prevent changes. If both passwords are set, users will need the open password to view the file and the permissions password to make edits.

visit here: https://www.sametools.com/pdf-pro/