Download pdfFactory Pro
PdfFactory Pro is an application that fills the requirements of any user who wants to protect their PDF files containing important data inside of them with a password or with encryption.
Its platform is based on Windows technology and you will find it very familiar, it's one of the best PDF encrypting tools you will be able to find because it works fast and without any delays. It's really light and it won't ever crash your computer.
In addition to that, the software also allows you to edit your documents and add effects, fonts, styles and bookmarks to it, and many other things.