/usr/lib/x86_64-linux-gnu/librviz.so is in librviz-dev 1.12.4+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librviz.so.2d
/usr/lib/x86_64-linux-gnu/librviz.so.2d