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?

-- hendrik