/usr/lib/pd/extra/rtc/per2pass.pd is in pd-rtclib 4.1-1.
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 | #N canvas 63 44 315 207 10;
#X obj 58 130 outlet;
#X obj 58 95 expr 100 - ($f1*100);
#X obj 58 21 inlet;
#X text 81 152 1993 by Karlheinz Essl;
#X obj 68 43 loadbang;
#X obj 58 68 f \$1;
#X connect 1 0 0 0;
#X connect 2 0 5 0;
#X connect 4 0 5 0;
#X connect 5 0 1 0;
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