New subject: licence of ditroff?

1 Feb 2005

...
  Date: Mon, 31 Jan 2005 17:50:26 +0000 (UTC)
 From: Thorsten Glaser &lt;tg(a)66h.42h.de&gt;
 Subject: Re: [TUHS] licence of ditroff?
 To: Aharon Robbins &lt;arnold(a)skeeve.com&gt;
 Cc: martinwguy(a)yahoo.it, miros-discuss(a)66h.42h.de, tuhs(a)minnie.tuhs.org

 Aharon Robbins dixit:

 Instead of starting with 27 year old code,
you'd be better
off taking the troff from http://www.swtch.com/plan9port. 
 Thanks, that's a nice idea, but from what I experienced,
 the portability of recent AT&T/Bell/Lucent/whatever code
 is worse than the bugs in old code (eg. I could not get
 ksh93 to compile, something in there just dumped core;
 but then that's Unix, not Plan 9). 
ksh93 is a different animal, from a different group, and problems
there are not surprising (sadly).

On the flip side, they do take bug reports seriously.

...
  This is a port
of many Plan 9 utilities to Unix.  The troff there
(a) has an explicit license that will probably do for the BSD people 
 If it's the same licence as for 8c, then no, unfortunately. 
I don't know.  It's worth double checking the current license; it
changed sometime in the past year or two.

The Plan 9 troff is certainly a descendant of the ditroff you
found, for whatever that's worth.

Arnold