/usr/share/doc/libcheese-gtk25/AUTHORS is in libcheese-gtk25 3.18.1-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcheese-gtk25/../libcheese8/AUTHORS
/usr/share/doc/libcheese-gtk25/../libcheese8/AUTHORS