66.13 PDF Password Protect
An individual pdf file can be password encrypted to
avoid trivial access. Two passwords are available, a user and owner
password. Here we set them both to be the same. The key length for
encryption is also specified, with possible lengths being 40, 128,
and 256. We choose 256 which is the PDF 2.0 encryption method and is
supported by Acrobat X. The --
stops processing command line
options. Two filenames are expected, the input pdf and the
output pdf.
$ qpdf --encrypt <password> <password> 256 -- mydoc.pdf mydoc_enc.pdf
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