174GNU GENERAL PUBLIC LICENSEVersion 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc.59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this licensedocument, but changing it is not allowed.PreambleThe licenses for most software are designed to take away your freedom toshare and change it. By contrast, the GNU General Public License is intendedto guarantee your freedom to share and change free software—to make surethe software is free for all its users. This General Public License applies to mostof the Free Software Foundationʼs software and to any other program whoseauthors commit to using it. (Some other Free Software Foundation software iscovered by the GNU Library General Public License instead.) You can apply itto your programs, too.When we speak of free software, we are referring to freedom, not price. OurGeneral Public Licenses are designed to make sure that you have the freedomto distribute copies of free software (and charge for this service if you wish), thatyou receive source code or can get it if you want it, that you can change thesoftware or use pieces of it in new free programs; and that you know you can dothese things.To protect your rights, we need to make restrictions that forbid anyone to denyyou these rights or to ask you to surrender the rights. These restrictionstranslate to certain responsibilities for you if you distribute copies of thesoftware, or if you modify it.For example, if you distribute copies of such a program, whether gratis or for afee, you must give the recipients all the rights that you have. You must makesure that they, too, receive or can get the source code. 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