Many users found a safe and smart solution to secure PDF files in Windows 10 but they didn’t get a trustworthy solution yet time. I want to suggest the easiest and most skillful tool that provides my best friend Jack Watson. Try the OSTtoPSTAPP PDF Protector Program. It helps you to secure a PDF document in Windows 10. Many people face various problems while protecting a PDF file so this program can easily and securely protect your PDF files.  You can apply a password to PDF files and protect PDFs from editing and copying. It is an advanced tool to unlock multiple PDF files at a time.  It restricts third parties from printing, editing, copying, and adding annotations. This utility is available on all Windows operating systems. For more information visit this app’s Official website.