/usr/lib/x86_64-linux-gnu/vdpau/libvdpau_radeonsi.so is in mesa-vdpau-drivers-lts-utopic 10.3.2-0ubuntu1~trusty2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/vdpau/libvdpau_radeonsi.so.1.0.0