/usr/lib/x86_64-linux-gnu/libdxflib.so is in libdxflib-dev 3.17.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdxflib.so.3.17.0
/usr/lib/x86_64-linux-gnu/libdxflib.so.3.17.0