/usr/share/doc/erlang-diameter/AUTHORS.gz is in erlang-diameter 1:14.b.4-dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/erlang-diameter/../erlang-base/AUTHORS.gz
/usr/share/doc/erlang-diameter/../erlang-base/AUTHORS.gz