You are free to distribute the Iron Hells as a binary or as source code so long as such distribution is in accordance with its license. You may also hack the Iron Hells to your heart's content so long as your end product is distributed in accordance with the license restrictions.
The following license applies to the Iron Hells:
Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke
This software may be copied and distributed for educational, research, and not for profit purposes provided that this copyright and statement are included in all such copies. Other copyrights may also apply.