/usr/share/doc/gir1.2-champlain-0.12/AUTHORS is in gir1.2-champlain-0.12 0.12.7-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-champlain-0.12/../libchamplain-0.12-0/AUTHORS