Hyperlatex is "free," this means that everyone is free to use it and free to redistribute it on certain conditions. Hyperlatex is not in the public domain; it is copyrighted and there are restrictions on its distribution as follows:
Copyright © 1994,1995,1996,1997 Otfried Schwarzkopf
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.