Ahead PDF Encrypt is a powerful tool that allows you to encrypt existing PDF files, set permissions, add user and owner password, set descriptions. With Ahead PDF Encrypt, you can easily set the owner password and restrictions on printing, editing and copying. You can also encrypt a PDF document by setting the user password, no one can open the PDF document except he knows the correct password. With Ahead PDF Encrypt, you can also batch edit and modify your PDFs metadata, such as PDF Title, Subject, Author and Keywords.