/usr/lib/x86_64-linux-gnu/libocsync.so is in libocsync-dev 0.91.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libocsync.so.0
/usr/lib/x86_64-linux-gnu/libocsync.so.0