Unlock Encrypted PDF for Editing

I have a single PDF that is currently locked with an unknown password. I need the protection completely removed so I can freely edit every page, copy text, and make design tweaks without any lingering restrictions. All I will provide is the original secured file; you return the exact same document but fully unlocked, identical in layout and quality, ready for standard editing in Adobe Acrobat or any PDF editor. If you automate the process with tools like qpdf, Ghostscript, or similar, please also confirm that no watermarks or compression artifacts are introduced. The job is done when I open the file and can save, print, and modify it without being prompted for a password.