/usr/lib/pd/extra/iemlib/hp2c~.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.
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#X obj 22 42 inlet~;
#X obj 56 63 inlet;
#X obj 22 193 outlet~;
#X text 62 42 ~signal_in~;
#X text 93 64 <float> cutoff_frequency [Hz];
#X obj 91 87 inlet;
#X text 195 136 <float> interpolation_time [ms];
#X text 32 176 ~filtered signal_out~;
#X obj 126 111 inlet;
#X obj 161 136 inlet;
#X text 127 87 <float> damping [-];
#X text 162 111 <float> frequency-shift [-];
#X text 12 8 hp2c~;
#X text 60 8 highpass 2.order for filter-cascades;
#X obj 22 157 filter~ hp2c \$1 \$2 \$3 \$4;
#X obj 56 211 outlet;
#X obj 88 236 outlet;
#X obj 119 255 outlet;
#X obj 161 274 outlet;
#X text 129 235 dummy;
#X text 159 254 dummy;
#X text 128 190 1.arg: <float> cutoff_frequency [Hz];
#X text 128 199 2.arg: <float> damping [-];
#X text 128 208 3.arg: <float> frequency-shift [-];
#X text 128 218 4.arg: <float> interpolation_time [ms] (opt.);
#X text 176 315 IEM KUG;
#X text 160 303 musil;
#X text 190 303 @;
#X text 196 303 iem.at;
#X text 111 292 (c) Thomas Musil 2000 - 2005;
#X text 159 325 Graz \, Austria;
#X connect 0 0 14 0;
#X connect 1 0 14 1;
#X connect 1 0 15 0;
#X connect 5 0 14 2;
#X connect 8 0 14 3;
#X connect 9 0 14 4;
#X connect 9 0 18 0;
#X connect 14 0 2 0;
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