(From file: triangle.c)

This program may be freely redistributed under the condition that the
copyright notices (including this entire header and the copyright
notice printed when the `-h' switch is selected) are not removed, and
no compensation is received.  Private, research, and institutional
use is free.  You may distribute modified versions of this code UNDER
THE CONDITION THAT THIS CODE AND ANY MODIFICATIONS MADE TO IT IN THE
SAME FILE REMAIN UNDER COPYRIGHT OF THE ORIGINAL AUTHOR, BOTH SOURCE
AND OBJECT CODE ARE MADE FREELY AVAILABLE WITHOUT CHARGE, AND CLEAR
NOTICE IS GIVEN OF THE MODIFICATIONS.  Distribution of this code as
part of a commercial system is permissible ONLY BY DIRECT ARRANGEMENT
WITH THE AUTHOR.  (If you are not directly supplying this code to a
customer, and you are instead telling them how they can obtain it for
free, then you are not required to make any arrangement with me.)

