/usr/lib/pd/extra/zexy/sigzero~-help.pd is in pd-zexy 2.2.6-2.
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 75 195 sigzero~;
#X obj 75 147 sig~;
#X floatatom 75 89 0 0 0 0 - - -;
#X floatatom 75 222 0 0 0 0 - - -;
#X obj 113 273 print signal;
#X obj 113 224 select 0;
#X msg 113 249 off;
#X msg 172 248 on;
#X text 72 42 sigzero~ detects whether there is a signal or not (e.g.
zeroes throughout);
#X obj 74 25 sigzero~;
#X msg 132 121 bang;
#X msg 131 145 off;
#X floatatom 131 168 0 0 0 0 - - -;
#X text 212 123 turn the detector on;
#X text 212 148 turn it off;
#X text 213 170 turn it on/off;
#X text 110 88 try me;
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#X obj 131 330 sigzero~;
#X text 209 330 that's how i use it;
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#X text 199 18 level;
#X msg 96 65 set \$1;
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#X msg 214 64 \; pd dsp 1;
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#X text 20 158 audio;
#X text 93 110 show level;
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#X text 93 389 output amplitude;
#X text 445 12 part of zexy;
#N canvas 558 166 494 344 META 0;
#X text 12 135 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 45 DESCRIPTION detects whether there is a signal or not
(e.g. zeroes throughout);
#X text 12 5 KEYWORDS signal analysis;
#X text 12 75 INLET_0 signal bang off float;
#X text 12 95 OUTLET_0 float;
#X text 12 115 AUTHOR IOhannes m zmoelnig;
#X restore 491 425 pd META;
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#X text 190 157 imagine we were doing some VERY heavy calcs here;
#X obj 427 48 inlet;
#X obj 427 75 switch~;
#X text 35 272 if the heavy calculations done here are done in vain
because there is no incoming signal \, it would be better to turn the
whole sub-patch off...;
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