====== PDF ======

===== Software =====
  * ''xournal'' - add notes on PDF documents

===== remove password =====

<code bash>
sudo apt install qpdf
qpdf --password-file=- --decrypt encrypted.pdf decrypted.pdf
</code>


===== attempt to perform an operation not allowed by the security policy =====


<code>
convert-im6.q16: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/421.
</code>

Workaround:
<code xml /etc/ImageMagick-6/policy.xml>
<policy domain="coder" rights="read|write" pattern="PDF" />
</code>