Remove Restrictions
$ qpdf --decrypt in.pdf out.pdf
How to Remove a Password from a PDF File in Linux
Removing PDF usage restrictions
How to remove security from a PDF file?
How to remove the password from a PDF?
Crack Password
$ sudo apt-get install pdfcrack $ pdfcrack -f pdf-encrypted.pdf $ qpdf --decrypt --password=DAS_PASSWORT
#!/usr/bin/env bash rm -rf out/* find . -maxdepth 1 -iname "*.pdf" | sed "s|^\./||" | while read f do qpdf --decrypt $f out/$f done
PDF Passwort knacken/herausfinden
Adobe Digital Editions (ADE) v1.7.1
Adobe Digital Editions (ADE) v2.0.1
How to Remove DRM from ePUB & PDF on Adobe Digital Editions ? (not proofed)
3 methods for removing DRM from ePUB on Adobe Digital Editions
github.com/apprenticeharper/DeDRM_tools, DeDRM tools for ebooks
Apprentice Alf’s Blog, Everything you ever wanted to know about DRM and ebooks, but were afraid to ask