/usr/share/doc/libjack-dev/TODO is in libjack-dev 1:0.124.1+20140122git5013bed0-3build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libjack-dev/../libjack0/TODO
/usr/share/doc/libjack-dev/../libjack0/TODO