/usr/lib/pd/extra/pdp/pdp_diff.pd is in pd-pdp 1:0.14.1-3build1.
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 8 9 10 11 12 13 14 | #N canvas 550 527 517 215 10;
#X obj 62 132 pdp_sub;
#X obj 62 104 pdp_reg;
#X obj 62 72 pdp_trigger bang pdp;
#X obj 62 38 inlet;
#X obj 62 163 outlet;
#X text 161 17 compute the difference between current;
#X text 161 33 and previous frame;
#X connect 0 0 4 0;
#X connect 1 0 0 1;
#X connect 2 0 1 0;
#X connect 2 1 1 1;
#X connect 2 1 0 0;
#X connect 3 0 2 0;
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