/usr/share/doc/libcjs-dev/changelog.Debian.gz is in libcjs-dev 2.8.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcjs-dev/../libcjs0/changelog.Debian.gz
/usr/share/doc/libcjs-dev/../libcjs0/changelog.Debian.gz