65.13 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.pdfYour donation will support ongoing availability and give you access to the PDF version of this book. Desktop Survival Guides include Data Science, GNU/Linux, and MLHub. Books available on Amazon include Data Mining with Rattle and Essentials of Data Science. Popular open source software includes rattle, wajig, and mlhub. Hosted by Togaware, a pioneer of free and open source software since 1984. Copyright © 1995-2022 Graham.Williams@togaware.com Creative Commons Attribution-ShareAlike 4.0
