/usr/lib/pd/extra/iem_dp/ is in pd-iemutils 0.0.20160217-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pd/extra/iem_dp/add__-help.pd
/usr/lib/pd/extra/iem_dp/add~~-help.pd
/usr/lib/pd/extra/iem_dp/delread~~-help.pd
/usr/lib/pd/extra/iem_dp/delwrite~~-help.pd
/usr/lib/pd/extra/iem_dp/div__-help.pd
/usr/lib/pd/extra/iem_dp/div~~-help.pd
/usr/lib/pd/extra/iem_dp/dptohex-help.pd
/usr/lib/pd/extra/iem_dp/dptosym-help.pd
/usr/lib/pd/extra/iem_dp/iem_dp.pd_linux
/usr/lib/pd/extra/iem_dp/max__-help.pd
/usr/lib/pd/extra/iem_dp/max~~-help.pd
/usr/lib/pd/extra/iem_dp/min__-help.pd
/usr/lib/pd/extra/iem_dp/min~~-help.pd
/usr/lib/pd/extra/iem_dp/mul__-help.pd
/usr/lib/pd/extra/iem_dp/mul~~-help.pd
/usr/lib/pd/extra/iem_dp/phasor~~-help.pd
/usr/lib/pd/extra/iem_dp/random__-help.pd
/usr/lib/pd/extra/iem_dp/samphold~~-help.pd
/usr/lib/pd/extra/iem_dp/sub~~-help.pd
/usr/lib/pd/extra/iem_dp/symtodp-help.pd
/usr/lib/pd/extra/iem_dp/tabread4__-help.pd
/usr/lib/pd/extra/iem_dp/tabread4~~-help.pd
/usr/lib/pd/extra/iem_dp/tabread__-help.pd
/usr/lib/pd/extra/iem_dp/tabread~~-help.pd
/usr/lib/pd/extra/iem_dp/tabwrite__-help.pd
/usr/lib/pd/extra/iem_dp/tabwrite~~-help.pd
/usr/lib/pd/extra/iem_dp/vd~~-help.pd
/usr/lib/pd/extra/iem_dp/vline~~-help.pd
/usr/lib/pd/extra/iem_dp/wrap~~-help.pd