/usr/share/doc/libcpprspserver-dev/ChangeLog.gz is in libcpprspserver-dev 3.0.1-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcpprspserver-dev/changelog.gz
/usr/share/doc/libcpprspserver-dev/changelog.gz