Remove PDF Password
Unlock a PDF you already have the password for, and save an unprotected copy.
How this works — please read
This only works if you already know the PDF's password — it can't crack or guess passwords, and won't attempt to. It opens the PDF with the password you provide, renders each page as an image, and saves a new PDF from those images without any password.
Trade-off: like Password Protect, the output loses selectable text — it becomes image-based pages.