1 GNU GENERAL PUBLIC LICENSE 2 Version 1, February 1989 3 4 Copyright (C) 1989 Free Software Foundation, Inc. 5 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 6 7 Everyone is permitted to copy and distribute verbatim copies 8 of this license document, but changing it is not allowed. 9 10 Preamble 11 12 The license agreements of most software companies try to keep users 13at the mercy of those companies. By contrast, our General Public 14License is intended to guarantee your freedom to share and change free 15software--to make sure the software is free for all its users. The 16General Public License applies to the Free Software Foundation's 17software and to any other program whose authors commit to using it. 18You can use it for your programs, too. 19 20 When we speak of free software, we are referring to freedom, not 21price. Specifically, the General Public License is designed to make 22sure that you have the freedom to give away or sell copies of free 23software, that you receive source code or can get it if you want it, 24that you can change the software or use pieces of it in new free 25programs; and that you know you can do these things. 26 27 To protect your rights, we need to make restrictions that forbid 28anyone to deny you these rights or to ask you to surrender the rights. 29These restrictions translate to certain responsibilities for you if you 30distribute copies of the software, or if you modify it. 31 32 For example, if you distribute copies of a such a program, whether 33gratis or for a fee, you must give the recipients all the rights that 34you have. You must make sure that they, too, receive or can get the 35source code. And you must tell them their rights. 36 37 We protect your rights with two steps: (1) copyright the software, and 38(2) offer you this license which gives you legal permission to copy, 39distribute and/or modify the software. 40 41 Also, for each author's protection and ours, we want to make certain 42that everyone understands that there is no warranty for this free 43software. If the software is modified by someone else and passed on, we 44want its recipients to know that what they have is not the original, so 45that any problems introduced by others will not reflect on the original 46authors' reputations. 47 48 The precise terms and conditions for copying, distribution and 49modification follow. 50 51 GNU GENERAL PUBLIC LICENSE 52 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 53 54 0. This License Agreement applies to any program or other work which 55contains a notice placed by the copyright holder saying it may be 56distributed under the terms of this General Public License. The 57"Program", below, refers to any such program or work, and a "work based 58on the Program" means either the Program or any work containing the 59Program or a portion of it, either verbatim or with modifications. Each 60licensee is addressed as "you". 61 62 1. You may copy and distribute verbatim copies of the Program's source 63code as you receive it, in any medium, provided that you conspicuously and 64appropriately publish on each copy an appropriate copyright notice and 65disclaimer of warranty; keep intact all the notices that refer to this 66General Public License and to the absence of any warranty; and give any 67other recipients of the Program a copy of this General Public License 68along with the Program. You may charge a fee for the physical act of 69transferring a copy. 70 71 2. You may modify your copy or copies of the Program or any portion of 72it, and copy and distribute such modifications under the terms of Paragraph 731 above, provided that you also do the following: 74 75 a) cause the modified files to carry prominent notices stating that 76 you changed the files and the date of any change; and 77 78 b) cause the whole of any work that you distribute or publish, that 79 in whole or in part contains the Program or any part thereof, either 80 with or without modifications, to be licensed at no charge to all 81 third parties under the terms of this General Public License (except 82 that you may choose to grant warranty protection to some or all 83 third parties, at your option). 84 85 c) If the modified program normally reads commands interactively when 86 run, you must cause it, when started running for such interactive use 87 in the simplest and most usual way, to print or display an 88 announcement including an appropriate copyright notice and a notice 89 that there is no warranty (or else, saying that you provide a 90 warranty) and that users may redistribute the program under these 91 conditions, and telling the user how to view a copy of this General 92 Public License. 93 94 d) You may charge a fee for the physical act of transferring a 95 copy, and you may at your option offer warranty protection in 96 exchange for a fee. 97 98Mere aggregation of another independent work with the Program (or its 99derivative) on a volume of a storage or distribution medium does not bring 100the other work under the scope of these terms. 101 102 3. You may copy and distribute the Program (or a portion or derivative of 103it, under Paragraph 2) in object code or executable form under the terms of 104Paragraphs 1 and 2 above provided that you also do one of the following: 105 106 a) accompany it with the complete corresponding machine-readable 107 source code, which must be distributed under the terms of 108 Paragraphs 1 and 2 above; or, 109 110 b) accompany it with a written offer, valid for at least three 111 years, to give any third party free (except for a nominal charge 112 for the cost of distribution) a complete machine-readable copy of the 113 corresponding source code, to be distributed under the terms of 114 Paragraphs 1 and 2 above; or, 115 116 c) accompany it with the information you received as to where the 117 corresponding source code may be obtained. (This alternative is 118 allowed only for noncommercial distribution and only if you 119 received the program in object code or executable form alone.) 120 121Source code for a work means the preferred form of the work for making 122modifications to it. For an executable file, complete source code means 123all the source code for all modules it contains; but, as a special 124exception, it need not include source code for modules which are standard 125libraries that accompany the operating system on which the executable 126file runs, or for standard header files or definitions files that 127accompany that operating system. 128 129 4. You may not copy, modify, sublicense, distribute or transfer the 130Program except as expressly provided under this General Public License. 131Any attempt otherwise to copy, modify, sublicense, distribute or transfer 132the Program is void, and will automatically terminate your rights to use 133the Program under this License. However, parties who have received 134copies, or rights to use copies, from you under this General Public 135License will not have their licenses terminated so long as such parties 136remain in full compliance. 137 138 5. By copying, distributing or modifying the Program (or any work based 139on the Program) you indicate your acceptance of this license to do so, 140and all its terms and conditions. 141 142 6. Each time you redistribute the Program (or any work based on the 143Program), the recipient automatically receives a license from the original 144licensor to copy, distribute or modify the Program subject to these 145terms and conditions. You may not impose any further restrictions on the 146recipients' exercise of the rights granted herein. 147 148 7. The Free Software Foundation may publish revised and/or new versions 149of the General Public License from time to time. Such new versions will 150be similar in spirit to the present version, but may differ in detail to 151address new problems or concerns. 152 153Each version is given a distinguishing version number. If the Program 154specifies a version number of the license which applies to it and "any 155later version", you have the option of following the terms and conditions 156either of that version or of any later version published by the Free 157Software Foundation. If the Program does not specify a version number of 158the license, you may choose any version ever published by the Free Software 159Foundation. 160 161 8. If you wish to incorporate parts of the Program into other free 162programs whose distribution conditions are different, write to the author 163to ask for permission. For software which is copyrighted by the Free 164Software Foundation, write to the Free Software Foundation; we sometimes 165make exceptions for this. Our decision will be guided by the two goals 166of preserving the free status of all derivatives of our free software and 167of promoting the sharing and reuse of software generally. 168 169 NO WARRANTY 170 171 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 172FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 173OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 174PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 175OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 176MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 177TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 178PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 179REPAIR OR CORRECTION. 180 181 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 182WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 183REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 184INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 185OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 186TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 187YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 188PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 189POSSIBILITY OF SUCH DAMAGES. 190 191 END OF TERMS AND CONDITIONS 192