/usr/lib/x86_64-linux-gnu/liberis-1.3.so.20 is in liberis-1.3-20 1.3.21-0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liberis-1.3.so.20.0.0
/usr/lib/x86_64-linux-gnu/liberis-1.3.so.20.0.0