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nethack/doc
G. Branden Robinson a33da92029 doc/*.6: Tweak copyright notices in man pages
Use *roff special character `\(co` for copyright sign.  This special
character identifier is _almost_ universally portable, dating back to
Ossanna troff in 1976.[1]  The exception is Plan 9 nroff, which claims
to be thoroughly UTF-8 oriented and should be able to render a copyright
sign.[2]  If no glyph for the character is available, the output device
driver degrades it to "c" (which is technically correct[3]), except for
groff, which falls back to "(C)"[4] only on its "ascii" output device.
All of groff's other devices have a a proper copyright sign.[5]

References:
[1] https://archive.org/details/unix-programmers-manual-seventh-edition-vol-2-1983/
    (pp. 196ff., see esp. "Table II", p. 227)
[2] https://github.com/9fans/plan9port/pull/735#issuecomment-3391733330
[3] https://www.copyright.gov/circs/circ03.pdf
[4] https://github.com/GitMirroring/groff/blob/a4d6e619afc8042b12084527c3c11eae919533e2/tmac/tty.tmac#L123
[5] https://paste.c-net.org/ComradesCourage
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