/usr/lib/x86_64-linux-gnu/libopencsg.so.1 is in libopencsg1 1.4.2-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libopencsg.so.1.4.2
/usr/lib/x86_64-linux-gnu/libopencsg.so.1.4.2