1Software License AgreementSoftware License Agreement GNU GENERAL PUBLIC LICENSEVersion 2, June 1991Copyright (C) 1989, 1991 Free Software Foundation, Inc.59 Temple Place, Suite 0, Boston, MA 0111-107 USAEveryone is permitted to copy and distribute verbatim copies of this license document, butchanging it is not allowed.PreambleThe licenses for most software are designed to take away your freedom to share andchange it. By contrast, the GNU General Public License is intended to guarantee yourfreedom to share and change free software--to make sure the software is free for all itsusers. This General Public License applies to most of the Free Software Foundation’ssoftware and to any other program whose authors commit to using it. (Some other FreeSoftware Foundation software is covered by the GNU Library General Public Licenseinstead.) You can apply it to your programs, too.When we speak of free software, we are referring to freedom, not price. Our General PublicLicenses are designed to make sure that you have the freedom to distribute copies of freesoftware (and charge for this service if you wish), that you receive source code or can getit if you want it, that you can change the software or use pieces of it in new free programs;and that you know you can do these things.To protect your rights, we need to make restrictions that forbid anyone to deny youthese rights or to ask you to surrender the rights. These restrictions translate to certainresponsibilities 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 () 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 everyoneunderstands 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 not theoriginal, so that any problems introduced by others will not reflect on the original authors’reputations.Finally, any free program is threatened constantly by software patents. We wish to avoid thedanger that redistributors of a free program will individually obtain patent licenses, in effectmaking the program proprietary. To prevent this, we have made it clear that any patentmust be licensed for everyone’s free use or not licensed at all.The precise terms and conditions for copying, distribution and modification follow.GNU GENERAL PUBLIC LICENSETERMS AND CONDITIONS FOR COPYING, DISTRIBUTION ANDMODIFICATION0. This License applies to any program or other work which contains a notice placed bythe copyright holder saying it may be distributed under the terms of this General PublicLicense. The “Program”, below, refers to any such program or work, and a “work basedon the Program” means either the Program or any derivative work under copyright law:that is to say, a work containing the Program or a portion of it, either verbatim or withmodifications and/or translated into another language. (Hereinafter, translation is includedwithout limitation in the term “modification”.) Each licensee is addressed as “you”.Activities other than copying, distribution and modification are not covered by this License;they are outside its scope. The act of running the Program is not restricted, and the outputfrom the Program is covered only if its contents constitute a work based on the Program(independent of having been made by running the Program). Whether that is true dependson what the Program does.1. You may copy and distribute verbatim copies of the Program’s source code as youreceive it, in any medium, provided that you conspicuously and appropriately publish oneach copy an appropriate copyright notice and disclaimer of warranty; keep intact all thenotices that refer to this License and to the absence of any warranty; and give any otherrecipients of the Program a copy of this License along with the Program.You may charge a fee for the physical act of transferring a copy, and you may at youroption offer warranty protection in exchange for a fee.. You may modify your copy or copies of the Program or any portion of it, thus forming awork based on the Program, and copy and distribute such modifications or work underthe terms of Section 1 above, provided that you also meet all of these conditions:a) You must cause the modified files to carry prominent notices stating that you changed thefiles and the date of any change.b) You must cause any work that you distribute or publish, that in whole or in part containsor is derived from the Program or any part thereof, to be licensed as a whole at nocharge to all third parties under the terms of this License.c) If the modified program normally reads commands interactively when run, you mustcause it, when started running for such interactive use in the most ordinary way, to printor display an announcement including an appropriate copyright notice and a notice thatthere is no warranty (or else, saying that you provide a warranty) and that users mayredistribute the program under these conditions, and telling the user how to view a copyof this License. (Exception: if the Program itself is interactive but does not normally printsuch an announcement, your work based on the Program is not required to print anannouncement.)These requirements apply to the modified work as a whole. If identifiable sections of thatwork are not derived from the Program, and can be reasonably considered independentand separate works in themselves, then this License, and its terms, do not apply to thosesections when you distribute them as separate works. But when you distribute the samesections as part of a whole which is a work based on the Program, the distribution of thewhole must be on the terms of this License, whose permissions for other licensees extendto the entire whole, and thus to each and every part regardless of who wrote it.Thus, it is not the intent of this section to claim rights or contest your rights to work writtenentirely by you; rather, the intent is to exercise the right to control the distribution ofderivative or collective works based on the Program.In addition, mere aggregation of another work not based on the Program with the Program(or with a work based on the Program) on a volume of a storage or distribution mediumdoes not bring the other work under the scope of this License.. You may copy and distribute the Program (or a work based on it, under Section ) inobject code or executable form under the terms of Sections 1 and above provided thatyou also do one of the following:a) Accompany it with the complete corresponding machine-readable source code, whichmust be distributed under the terms of Sections 1 and above on a medium customarilyused for software interchange; or,b) Accompany it with a written offer, valid for at least three years, to give any third party, fora charge no more than your cost of physically performing source distribution, a completemachine-readable copy of the corresponding source code, to be distributed under theterms of Sections 1 and above on a medium customarily used for software interchange;or,c) Accompany it with the information you received as to the offer to distribute correspondingsource code. (This alternative is allowed only for noncommercial distribution and only ifyou received the program in object code or executable form with such an offer, in accordwith Subsection b above.)The source code for a work means the preferred form of the work for making modificationsto it. For an executable work, complete source code means all the source code for allmodules it contains, plus any associated interface definition files, plus the scripts used tocontrol compilation and installation of the executable. However, as a special exception,the source code distributed need not include anything that is normally distributed (in eithersource or binary form) with the major components (compiler, kernel, and so on) of theoperating system on which the executable runs, unless that component itself accompaniesthe executable.If distribution of executable or object code is made by offering access to copy from adesignated place, then offering equivalent access to copy the source code from the sameplace counts as distribution of the source code, even though third parties are not compelledto copy the source along with the object code.4. You may not copy, modify, sublicense, or distribute the Program except as expresslyprovided under this License. Any attempt otherwise to copy, modify, sublicense ordistribute the Program is void, and will automatically terminate your rights under thisLicense. However, parties who have received copies, or rights, from you under thisLicense will not have their licenses terminated so long as such parties remain in fullcompliance.5. You are not required to accept this License, since you have not signed it. However,nothing else grants you permission to modify or distribute the Program or its derivativeworks. These actions are prohibited by law if you do not accept this License. Therefore,by modifying or distributing the Program (or any work based on the Program), youindicate your acceptance of this License to do so, and all its terms and conditions forcopying, distributing or modifying the Program or works based on it.6. Each time you redistribute the Program (or any work based on the Program), therecipient automatically receives a license from the original licensor to copy, distributeor modify the Program subject to these terms and conditions. You may not impose anyfurther restrictions on the recipients’ exercise of the rights granted herein. You are notresponsible for enforcing compliance by third parties to this License.7. If, as a consequence of a court judgment or allegation of patent infringement or for anyother reason (not limited to patent issues), conditions are imposed on you (whetherby court order, agreement or otherwise) that contradict the conditions of this License,they do not excuse you from the conditions of this License. If you cannot distribute soas to satisfy simultaneously your obligations under this License and any other pertinentobligations, then as a consequence you may not distribute the Program at all. Forexample, if a patent license would not permit royalty-free redistribution of the Programby all those who receive copies directly or indirectly through you, then the only way youcould satisfy both it and this License would be to refrain entirely from distribution of theProgram.If any portion of this section is held invalid or unenforceable under any particularcircumstance, the balance of the section is intended to apply and the section as a whole isintended to apply in other circumstances.It is not the purpose of this section to induce you to infringe any patents or other propertyright claims or to contest validity of any such claims; this section has the sole purpose ofprotecting the integrity of the free software distribution system, which is implemented bypublic license practices. Many people have made generous contributions to the wide rangeof software distributed through that system in reliance on consistent application of thatsystem; it is up to the author/donor to decide if he or she is willing to distribute softwarethrough any other system and a licensee cannot impose that choice.This section is intended to make thoroughly clear what is believed to be a consequence ofthe rest of this License.8. If the distribution and/or use of the Program is restricted in certain countries eitherby patents or by copyrighted interfaces, the original copyright holder who places theProgram under this License may add an explicit geographical distribution limitationexcluding those countries, so that distribution is permitted only in or among countries notthus excluded. In such case, this License incorporates the limitation as if written in thebody of this License.9. The Free Software Foundation may publish revised and/or new versions of the GeneralPublic License from time to time. Such new versions will be similar in spirit to the presentversion, but may differ in detail to address new problems or concerns.
