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Encrypting and decrypting PDFs using QPDF
Saturday, March 14, 2020
If you have a password-protected PDF and want to generate a decrypted version, it’s very simple with QPDF:
$ qpdf --password=123 --decrypt input.pdf output.pdf
To avoid entering the password on the command line (perhaps you don’t want it saved in your shell history):
$ qpdf @- --decrypt input.pdf output.pdf
Then enter --password=123 and hit enter and ^D.
To encrypt a PDF, do this:
$ qpdf --encrypt userPw ownerPw 256 -- input.pdf output.pdf
Similarly, to avoid including the passwords in the command, do this:
$ qpdf --encrypt @- @- 256 -- input.pdf output.pdf
And then type the user password, hit enter, the owner password, enter, and ^D.
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KINCAIDE3 on Sunday, January 3, 2021 at 23:02
Thank you!!1