/usr/share/doc/libgupnp-av-1.0-dev/AUTHORS is in libgupnp-av-1.0-dev 0.10.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgupnp-av-1.0-dev/../libgupnp-av-1.0-2/AUTHORS
/usr/share/doc/libgupnp-av-1.0-dev/../libgupnp-av-1.0-2/AUTHORS