You can lock PDF files with a password in various ways such as manually or by using an expert tool. Most of the users avoid using a manual technique because of its drawbacks like the risk of data loss, security issues, etc. So, the best solution to set security on the PDF files is to use trusted software like Softaken PDF Protector. The expert program seamlessly sets the password on the Adobe PDF file without compromising security. This advanced program is easy and simple to use, and no tech expertise is needed to use this software. Moreover, these applications are fully compatible with all the latest and older versions of the Windows Operating System.