/usr/lib/pd/extra/pdp/pdp_bqt-help.pd is in pd-pdp 1:0.14.1-3build1.
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 floatatom 88 211 5 0 0;
#X msg 27 211 onep \$1;
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#X msg 27 246 twop \$1;
#X obj 454 406 t b f;
#X floatatom 489 369 5 0 0;
#X floatatom 488 317 5 0 0;
#X obj 454 436 pack s 0 0;
#X msg 454 469 \$1 \$2 \$3;
#X obj 489 405 t b f;
#X msg 410 370 lpf;
#X msg 409 344 hpf;
#X msg 409 398 apf;
#X msg 409 425 bsf;
#X obj 461 38 pdp_help_input;
#X msg 461 13 start;
#X msg 507 13 stop;
#X obj 27 616 pdp_help_output;
#X obj 461 93 pdp_route 3;
#X obj 533 65 hdl 15 1 0 3 empty empty empty 0 -6 0 8 -262144 -1 -1
0;
#X obj 40 540 r \$0-out;
#X obj 558 231 s \$0-out;
#X floatatom 490 157 5 0 0;
#X floatatom 601 156 5 0 0;
#X text 312 358 high pass;
#X text 313 382 low pass;
#X text 314 410 all pass;
#X text 313 439 band stop;
#X text 541 367 pole Q;
#X text 99 31 it is a bit awkward to use directly;
#X text 146 210 one pole filter;
#X text 145 240 double one pole filter;
#X msg 88 180 0.1;
#X msg 502 133 0.5;
#X msg 600 133 0.5;
#X text 588 62 choose example here;
#X text 93 91 "unstable" behaviour is possible;
#X msg 490 347 0.1;
#X msg 488 293 0.3;
#X obj 27 590 pdp_gain;
#X floatatom 118 564 5 0 0;
#X msg 118 542 1;
#X text 95 107 when frequency and Q are outside their;
#X text 96 122 sensible ranges;
#X text 264 342 set the filter type:;
#X text 136 192 set the filter type:;
#X text 538 319 (between 0 and 1 \, 0.5 = nyquist);
#X text 540 333 comment;
#X text 540 305 pole frequency;
#X text 37 16 pdp_bqt: a temporal biquad filter;
#X text 99 45 try one of the abstractions (pdp_motion_blur and;
#X text 100 61 pdp_motion_phase);
#X obj 434 190 pdp_motion_blur;
#X obj 558 190 pdp_motion_phase;
#X obj 27 499 pdp_bqt;
#X msg 48 312 reset;
#X text 95 313 reset state;
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