/usr/lib/pd/extra/iemlib/hp2_dp~.pd is in pd-iemlib 1.20.1-1.
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 435 244 379 285 10;
#X obj 22 42 inlet~;
#X obj 53 65 inlet;
#X obj 22 186 outlet~;
#X text 62 42 ~signal_in~;
#X text 89 64 <float> cutoff_frequency [Hz];
#X obj 85 89 inlet;
#X text 184 113 <float> interpolation_time [ms];
#X text 28 157 ~filtered signal_out~;
#X obj 149 112 inlet;
#X text 120 89 <float> Q [-];
#X text 88 177 1.arg: <float> cutoff_frequency [Hz];
#X text 88 186 2.arg: <float> Q [-];
#X text 88 196 3.arg: <float> interpolation_time [ms] (opt.);
#X text 176 245 IEM KUG;
#X text 154 233 musil;
#X text 190 233 @;
#X text 198 233 iem.at;
#X text 159 255 Graz \, Austria;
#X text 11 9 hp2_dp~;
#X text 79 9 highpass 2.order with double precision;
#X obj 22 136 filter~ dhp2 \$1 \$2 1 \$3;
#X text 113 223 (c) Thomas Musil 2000 - 2010;
#X connect 0 0 20 0;
#X connect 1 0 20 1;
#X connect 5 0 20 2;
#X connect 8 0 20 4;
#X connect 20 0 2 0;
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