To unlock PDF file security, you can use the SysInfo PDF Unlocker Tool. It allows you to add one or more encrypted PDF files at the same time. You can also add a full folder that contains protected PDF files using the Add Files or Add Folder option. After adding them, all files appear in a clear tree view, so you can easily check and manage them. With this tool, users can choose between two options: unlock only protected PDF file(s) or unlock all PDF files. This feature allows you to remove security from a single locked file or from all selected PDFs at once, without affecting the original data. It also lets you manage the password for the output file easily. You can keep the existing password, remove the password completely, or set a new password without any hassle. This simple and user-friendly tool does not require any technical knowledge and supports PDF files created with all versions of Adobe Acrobat DC, from 1.0 to 11.0. It runs smoothly on all Windows operating systems, including the latest Windows 11, as well as macOS.