/usr/share/doc/libjsonrpccpp-client0/changelog.Debian.gz is in libjsonrpccpp-client0 0.6.0-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libjsonrpccpp-client0/../libjsonrpccpp-common0/changelog.Debian.gz