/usr/lib/pd/extra/hid/keyboard.pd is in pd-hid 0.7-3.
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 | #N canvas 0 22 470 320 10;
#X msg 96 64 start;
#X msg 105 83 stop;
#X obj 77 30 inlet;
#X obj 77 107 hid \$1;
#X obj 77 139 route key;
#X obj 77 273 outlet;
#X connect 0 0 3 0;
#X connect 1 0 3 0;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 4 0 5 0;
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