/usr/lib/pd/extra/iemguts/receivecanvas-help.pd is in pd-iemguts 0.2.1-3.
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 13 14 15 16 17 18 | #N canvas 33 0 430 262 10;
#N canvas 386 115 340 151 subpatch 0;
#N canvas 450 70 152 94 subsubpatch 0;
#X obj 2 10 receivecanvas 1;
#X obj 2 37 print pd-subpatch;
#X connect 0 0 1 0;
#X restore 52 90 pd subsubpatch;
#X text 48 33 The first argument sets the parent depth.;
#X text 51 49 Have a look at the subsubpatch.;
#X restore 26 206 pd subpatch;
#X obj 25 104 receivecanvas 0;
#X obj 25 129 print receivecanvas-help.pd;
#X obj 23 16 receivecanvas;
#X text 111 16 receives all messages sent to the canvas;
#X text 21 66 depth 0 receives from the canvas containing the [receivecanvas]
object.;
#X text 25 181 Check also:;
#X connect 1 0 2 0;
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