/usr/lib/pd/extra/iemmatrix/mtx_rot-help.pd is in pd-iemmatrix 0.2-1.
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 19 20 21 22 23 24 25 26 27 28 | #N canvas 541 188 450 300 10;
#X obj 72 78 hsl 128 15 0 360 0 0 empty empty empty -2 -8 0 10 -262144
-1 -1 0 1;
#X floatatom 69 98 5 0 0 0 - - -;
#X obj 69 115 *;
#X obj 225 105 atan;
#X msg 225 85 1;
#X obj 225 65 loadbang;
#X obj 225 124 / 45;
#X obj 69 136 mtx_rot;
#X obj 69 173 mtx_print R;
#X text 58 23 2 dimensional cartesian rotation matrix;
#X msg 33 51 0;
#X msg 64 51 90;
#X msg 94 51 180;
#X msg 126 51 270;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X connect 2 0 7 0;
#X connect 3 0 6 0;
#X connect 4 0 3 0;
#X connect 5 0 4 0;
#X connect 6 0 2 1;
#X connect 7 0 8 0;
#X connect 10 0 1 0;
#X connect 11 0 1 0;
#X connect 12 0 1 0;
#X connect 13 0 1 0;
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