/usr/lib/x86_64-linux-gnu/libbluray.so is in libbluray-dev 1:0.9.3-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libbluray.so.1.10.0
/usr/lib/x86_64-linux-gnu/libbluray.so.1.10.0