/usr/share/doc/liberis-1.3-15-dbg/changelog.Debian.gz is in liberis-1.3-15-dbg 1.3.14-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liberis-1.3-15-dbg/../liberis-1.3-15/changelog.Debian.gz