/usr/lib/pd/extra/rtc/RTC-Overview.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 12 13 14 15 16 17 18 19 20 | #N canvas 207 113 449 332 10;
#X text 173 198 DSP objects for MSP;
#X text 173 55 list operations;
#X text 173 34 random and chance operations;
#X text 173 13 basic low-level functions;
#X text 173 106 pitch-related functions;
#X text 173 149 dynamics \, ramps \, etc.;
#X text 173 128 time-based functions;
#X text 19 238 Real Time Composition Library vs. 4.1 for wMAX;
#X text 19 252 (c) 1993-2006 by Karlheinz Essl <www.essl.at>;
#X obj 33 13 rtc-help/Toolbox;
#X obj 33 34 rtc-help/Chance;
#X obj 33 55 rtc-help/Lists;
#X obj 33 105 rtc-help/Harmony;
#X obj 33 125 rtc-help/Rhythm;
#X obj 33 146 rtc-help/Envelopes;
#X obj 33 197 rtc-help/MSP-RTC;
#X text 15 78 ___________________________________________________;
#X text 15 172 ___________________________________________________
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