"This software program is licensed subject to the GNU General Public License (GPL). Version 2, June 1991, available at <http://www.fsf.org/copyleft/gpl.html>"GNU General Public License Version 2, June 1991Copyright (C) 1989, 1991 Free Software Foundation, Inc.  59 Temple Place - Suite 330, Boston, MA  02111-1307, USAEveryone 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 to share and change it. By contrast, the GNU General Public License is intendedto guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to 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 freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it 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 you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distributecopies of the software, or if you modify it.For example, if you distribute copies of such a program, whether gratis or for a fee, you must 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 know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license 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 understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, 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 the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION0. This License applies to any program or other work which contains a notice   placed by the copyright holder saying it may be distributed under the    terms of this General Public License. The "Program", below, refers to any   such program or work, and a "work based on 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 with    modifications and/or translated into another language. (Hereinafter,    translation is included without 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 output from 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 depends   on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code    as you receive it, in any medium, provided that you conspicuously and    appropriately publish on each copy an appropriate copyright notice and    disclaimer of warranty; keep intact all the notices that refer to this    License and to the absence of any warranty; and give any other recipients    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 your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it,    thus forming a work based on the Program, and copy and distribute such    modifications or work under the 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 the files and the date of any change.    * b) You must cause any work that you distribute or publish, that in         whole or in part contains or is derived from the Program or any part         thereof, to be licensed as a whole at no charge to all third parties        under the terms of this License.    * c) If the modified program normally reads commands interactively when         run, you must cause it, when started running for such interactive         use in the most ordinary way, to print or display an announcement         including an appropriate copyright notice and a notice that there is        no warranty (or else, saying that you provide a warranty) and that         users may redistribute the program under these conditions, and         telling the user how to view a copy of this License. (Exception: if         the Program itself is interactive but does not normally print such         an announcement, your work based on the Program is not required to         print an announcement.)    These requirements apply to the modified work as a whole. If identifiable    sections of that work are not derived from the Program, and can be    reasonably considered independent and separate works in themselves, then    this License, and its terms, do not apply to those sections when you    distribute them as separate works. But when you distribute the same    sections as part of a whole which is a work based on the Program, the    distribution of the whole must be on the terms of this License, whose    permissions for other licensees extend to 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 written entirely by you; rather, the intent is to    exercise the right to control the distribution of derivative 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 medium does not bring the other work under the    scope of this License. 3. You may copy and distribute the Program (or a work based on it, under    Section 2) in object code or executable form under the terms of Sections    1 and 2 above provided that you also do one of the following:    * a) Accompany it with the complete corresponding machine-readable source         code, which must be distributed under the terms of Sections 1 and 2         above on a medium customarily used for software interchange; or,    * b) Accompany it with a written offer, valid for at least three years,         to give any third party, for a charge no more than your cost of         physically performing source distribution, a complete machine-        readable copy of the corresponding source code, to be distributed         under the terms of Sections 1 and 2 above on a medium customarily         used for software interchange; or,    * c) Accompany it with the information you received as to the offer to         distribute corresponding source code. (This alternative is allowed         only for noncommercial distribution and only if you received the         program in object code or executable form with such an offer, in         accord with Subsection b above.)    The source code for a work means the preferred form of the work for    making modifications to it. For an executable work, complete source code    means all the source code for all modules it contains, plus any    associated interface definition files, plus the scripts used to control    compilation and installation of the executable. However, as a special    exception, the source code distributed need not include anything that is    normally distributed (in either source or binary form) with the major    components (compiler, kernel, and so on) of the operating system on which   the executable runs, unless that component itself accompanies the    executable.    If distribution of executable or object code is made by offering access    to copy from a designated place, then offering equivalent access to copy