/usr/lib/x86_64-linux-gnu/libobt.so is in openbox-dev 3.6.1-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libobt.so.2.0.2
/usr/lib/x86_64-linux-gnu/libobt.so.2.0.2