/usr/share/doc/libqpdf-dev/README.gz is in libqpdf-dev 5.1.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libqpdf-dev/../libqpdf13/README.gz
/usr/share/doc/libqpdf-dev/../libqpdf13/README.gz