/usr/lib/pd/extra/iemmatrix/iemmatrix-meta.pd is in pd-iemmatrix 0.3-4.
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 | #N canvas 10 10 200 200 10;
#N canvas 20 20 420 300 META 0;
#X text 10 10 META this is a prototype of a libdir meta file;
#X text 10 30 NAME iemmatrix;
#X text 10 50 AUTHOR IOhannes m zmoelnig\, Thomas Musil\, Franz Zotter;
#X text 10 70 LICENSE GPL-2;
#X text 10 90 VERSION 0.3;
#X restore 10 10 pd META;
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