I haven't actually done anything like this on Linux - only at work on
a Windos box, but I can't see any reason why the same principle
wouldn't apply on Linux.
We often get scanned-PDF's which were scanned upside-down, so I open
it in acrobat, rotate it a couple of times, and 'print' it to the PDF
converter, which essentially creates a new PDF from the previous
upside-down one. In your case, you'd be creating a passwordless PDF
from a password-protected one.
I am of-course assuming that the PDF was not password protectected as
a copyright-protection-measure, incase some burotwat starts quoting
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