Is it PDF/E and simply has extra encryption or a password?
See does it open in Ghostview (windows), Xodo (android) or Okular (Linux).
Also if your pdfe viewer (which OS and who makes it?) has a Print option, then add a PDF file printer as a Printer and print to it to make a PDF.
Last edited by Quoth; 08-16-2023 at 12:53 PM.
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