Never mind! I found out how already.

On Mon, Aug 26, 2024 at 07:52:12PM -0400, Hendrik Boom wrote:
> I have an encrypted pdf with a known key.
> I can use qpdfview to read it, no problem. I just enter a password on request.
>
> But what I don't seem to do is produce a decrypted pdf. If I try to save it,
> after reading the plaintext onscreen, it saves it encrypted.
>
> If I try to print it, the proint fails.
>
> How does one decrypt and encrypted pdf on Devuan daedalus?

The utility that does this is qpdf, not qpdfview.
man qpdf provides a link to the documentation,
which resides at https://qpdf.readthedocs.io/en/stable/

-- hendrik
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