GNU GENERAL PUBLIC LICENSEVersion 2, June 1991Copyright (C) 1989, 1991 Free Software Foundation, Inc.51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USAEveryone is permitted to copy and distribute verbatim copies of this license document,but changing it is not allowed.PreambleThe licenses for most software are designed to take away your freedom to share and changeit. By contrast, the GNU General Public License is intended to guarantee your freedomto share and change free software--to make sure the software is free for all its users. ThisGeneral Public License applies to most of the Free Software Foundation's software andto any other program whose authors commit to using it. (Some other Free SoftwareFoundation software is covered by the GNU Lesser General Public License instead.) Youcan apply it to your programs, too.When we speak of free software, we are referring to freedom, not price. Our GeneralPublic Licenses are designed to make sure that you have the freedom to distribute copiesof free software (and charge for this service if you wish), that you receive source code orcan get it if you want it, that you can change the software or use pieces of it in new freeprograms; and that you know you can do these things.When we speak of free software, we are referring to freedom, not price. Our GeneralPublic Licenses are designed to make sure that you have the freedom to distribute copiesof free software (and charge for this service if you wish), that you receive source code orcan get it if you want it, that you can change the software or use pieces of it in new freeprograms; and that you know you can do these things.To protect your rights, we need to make restrictions that forbid anyone to deny you theserights or to ask you to surrender the rights. These restrictions translate to certain respon-sibilities for you if you distribute copies of the software, or if you modify it.For example, if you distribute copies of such a program, whether gratis or for a fee, youmust give the recipients all the rights that you have. You must make sure that they, too,receive or can get the source code. And you must show them these terms so they knowtheir rights.We protect your rights with two steps: (1) copyright the software, and (2) offer you thislicense which gives you legal permission to copy, distribute and/or modify the software.Also, for each author's protection and ours, we want to make certain that everyone under-stands that there is no warranty for this free software. If the software is modified bysomeone else and passed on, we want its recipients to know that what they have is notChapter 13 - Third party software 419GNU GENERAL PUBLIC LICENSE
