Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation.
AUTHOR
Desmond Daignault <tekdd@dtol.datatimes.com>, 05-Sep-96. (Original
xlock version was called tri.c.)
Ability to run standalone or with xscreensaver added by
Jamie Zawinski <jwz@jwz.org>, 10-May-97. (Renamed to sierpinski.)