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I have used this robust tool for unlocking the PDF file, you can also try this trusted tool to unprotect your document. 

If you're looking for a solution to unlock restricted PDFs, SysTools PDF Unlocker is indeed effective. It removes passwords, allows editing, copying, and printing, and preserves the original format. Similar to how you can Lightroom mod apk download without watermark for enhanced editing, this tool provides a seamless experience for unprotected documents.