1 GNU GENERAL PUBLIC LICENSE 2 Version 2, June 1991 3 4 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 Everyone is permitted to copy and distribute verbatim copies 7 of this license document, but changing it is not allowed. 8 9 Preamble 10 11 The licenses for most software are designed to take away your 12freedom to share and change it. By contrast, the GNU General Public 13License is intended to guarantee your freedom to share and change free 14software--to make sure the software is free for all its users. This 15General Public License applies to most of the Free Software 16Foundation's software and to any other program whose authors commit to 17using it. (Some other Free Software Foundation software is covered by 18the GNU Lesser General Public License instead.) You can apply it to 19your programs, too. 20 21 When we speak of free software, we are referring to freedom, not 22price. Our General Public Licenses are designed to make sure that you 23have the freedom to distribute copies of free software (and charge for 24this service if you wish), that you receive source code or can get it 25if you want it, that you can change the software or use pieces of it 26in new free programs; and that you know you can do these things. 27 28 To protect your rights, we need to make restrictions that forbid 29anyone to deny you these rights or to ask you to surrender the rights. 30These restrictions translate to certain responsibilities for you if you 31distribute copies of the software, or if you modify it. 32 33 For example, if you distribute copies of such a program, whether 34gratis or for a fee, you must give the recipients all the rights that 35you have. You must make sure that they, too, receive or can get the 36source code. 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For software which is copyrighted by the Free 253Software Foundation, write to the Free Software Foundation; we sometimes 254make exceptions for this. Our decision will be guided by the two goals 255of preserving the free status of all derivatives of our free software and 256of promoting the sharing and reuse of software generally. 257 258 NO WARRANTY 259 260 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 261FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 262OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 263PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 264OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 265MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 266TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 267PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 268REPAIR OR CORRECTION. 269 270 12. 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