/usr/lib/x86_64-linux-gnu/librsb.so.0 is in librsb0 1.2.0-rc5-3+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librsb.so.0.0.0
/usr/lib/x86_64-linux-gnu/librsb.so.0.0.0