/usr/lib/pd/extra/boids/LICENSE.txt is in pd-boids 1.1.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pd/extra/boids/../../../../share/common-licenses/GPL-2
/usr/lib/pd/extra/boids/../../../../share/common-licenses/GPL-2