Users can protect PDF files with the PDF Lock tool that lets individuals set multiple passwords and limits. As the use of digital documents grows it becomes more and more important to keep private information safe inside PDF files. This tool lets users protect their PDF files with a password so unauthorized people can't get to them. Encryption adds a strong layer of security to protect private data by making sure that only people who know the right password can read, view or change the file. PDF Lock is beneficial for both new and experienced users because it is simple to use and has quick access. You can set a password to view the PDF file and the program also lets users restrict changing, copying, printing, and data extraction. Users can use a free trial version.