/usr/share/doc/libsipwitch-dev/TODO is in libsipwitch-dev 1.6.1-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsipwitch-dev/../libsipwitch1/TODO
/usr/share/doc/libsipwitch-dev/../libsipwitch1/TODO