/usr/lib/pd/extra/pdp_grey.pd is in pd-pdp 1:0.12.5-1.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #N canvas 608 510 395 122 10;
#X obj 39 23 inlet;
#X obj 39 51 pdp_convert image/grey/*;
#X obj 39 79 outlet;
#X text 101 21 backwards compatibility abstraction;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
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