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Software
xournal- add notes on PDF documents
remove password
sudo apt install qpdf qpdf --password-file=- --decrypt encrypted.pdf decrypted.pdf
attempt to perform an operation not allowed by the security policy
convert-im6.q16: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/421.
Workaround:
- /etc/ImageMagick-6/policy.xml
<policy domain="coder" rights="read|write" pattern="PDF" />