I have a PDF file that is locked, and I don’t have Adobe Acrobat installed on my system. I need to remove the restrictions so I can edit, print, or copy the content. Is there a way to unlock a PDF without using Adobe? I’m looking for a reliable method or tool that can do this safely. Although, I have used SysTools PDF Unlocker as one of the solution. If you have other way, please provide the answer.