Enter the following parameter after the existing file can be encrypted into a PDF version:

-I -> the current PDF document

-O -> a new encrypted file

-U -> requires a user password settings

Do not set the-x (the owner of the password), because this option only with the permission of the PDF document. If only owner password is set to decide who is allowed to print, then anyone can open the PDF file, but can not print it.

Automator is the use of different control options available in a typical example of the procedure. As I said before, when it installed the program will automatically create a Automator control. Like this: