📅 2012-Nov-25 ⬩ ✍️ Ashwin Nanjappa ⬩ 🏷️ encryption, pdf, qpdf ⬩ 📚 Archive
QPDF can be used to check if a PDF file is encrypted or not. If the file is encrypted, QPDF also prints out all the encryption information about the file.
To view encryption information of a file:
$ qpdf --show-encryption foo.pdf
Tried with: QPDF 3.0.2