/usr/share/doc/libtiff-opengl/TODO is in libtiff-opengl 3.9.5-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtiff-opengl/../libtiff4/TODO
/usr/share/doc/libtiff-opengl/../libtiff4/TODO