How to set permissions for a PDF file to avoid being printed and edited by others?

According to your need, I suggest you to use A-PDF Password Security. It is a simple to use PDF tool for you to set permissions for a PDF file to avoid being printed and edited by others. There are kinds of methods to set the password: 40-bit RC4 encryption, which is supported by Adobe Acrobat 3.0 or above; 128-bit RC4 encryption, which is supported by Adobe Acrobat Reader 5.0 or above. Besides, you can batch set the password for multiple PDF files. Now the below tutorial will show you the details, just follow it:

Launch A-PDF Password Security software, if you have not installed it, please download it from: http://a-pdf.com/security/password.htm

The interface of password setting has three options: Single PDF document Security (means set password for a PDF), Hot Directory (monitor a directory) and Batch PDF Documents Security (batch set password for many PDFs). According to your need, choose one of them; take single PDF security as example here:

Click "Next" to browse and open PDF document, set password to control the permissions of PDF, such as print/edit/copy and so on.

And then save/ save as security PDF document.