``` <policy domain="coder" rights="read | write" pattern="PDF" /> ``` Extra: convert images to pdf file ``` convert *.JPG out.pdf ``` Reference: https://stackoverflow.com/questions/8955425/how-can-i-convert-a-series-of-images-to-a-pdf-from-the-command-line-on-linux https://stackoverflow.com/a/53180170/9039813