/usr/lib/pd/extra/iemlib/LICENSE.txt is in pd-iemlib 1.20.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pd/extra/iemlib/../../../../share/common-licenses/LGPL-2.1
/usr/lib/pd/extra/iemlib/../../../../share/common-licenses/LGPL-2.1