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0001 GNU GENERAL PUBLIC LICENSE
0002 Version 2, June 1991
0003 
0004 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
0005 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
0006 
0007 Everyone is permitted to copy and distribute verbatim copies of this license
0008 document, but changing it is not allowed.
0009 
0010 Preamble
0011 
0012 The licenses for most software are designed to take away your freedom to share
0013 and change it. By contrast, the GNU General Public License is intended to
0014 guarantee your freedom to share and change free software--to make sure the
0015 software is free for all its users. This General Public License applies to
0016 most of the Free Software Foundation's software and to any other program whose
0017 authors commit to using it. (Some other Free Software Foundation software
0018 is covered by the GNU Lesser General Public License instead.) You can apply
0019 it to your programs, too.
0020 
0021 When we speak of free software, we are referring to freedom, not price. Our
0022 General Public Licenses are designed to make sure that you have the freedom
0023 to distribute copies of free software (and charge for this service if you
0024 wish), that you receive source code or can get it if you want it, that you
0025 can change the software or use pieces of it in new free programs; and that
0026 you know you can do these things.
0027 
0028 To protect your rights, we need to make restrictions that forbid anyone to
0029 deny you these rights or to ask you to surrender the rights. These restrictions
0030 translate to certain responsibilities for you if you distribute copies of
0031 the software, or if you modify it.
0032 
0033 For example, if you distribute copies of such a program, whether gratis or
0034 for a fee, you must give the recipients all the rights that you have. You
0035 must make sure that they, too, receive or can get the source code. And you
0036 must show them these terms so they know their rights.
0037 
0038 We protect your rights with two steps: (1) copyright the software, and (2)
0039 offer you this license which gives you legal permission to copy, distribute
0040 and/or modify the software.
0041 
0042 Also, for each author's protection and ours, we want to make certain that
0043 everyone understands that there is no warranty for this free software. If
0044 the software is modified by someone else and passed on, we want its recipients
0045 to know that what they have is not the original, so that any problems introduced
0046 by others will not reflect on the original authors' reputations.
0047 
0048 Finally, any free program is threatened constantly by software patents. We
0049 wish to avoid the danger that redistributors of a free program will individually
0050 obtain patent licenses, in effect making the program proprietary. To prevent
0051 this, we have made it clear that any patent must be licensed for everyone's
0052 free use or not licensed at all.
0053 
0054 The precise terms and conditions for copying, distribution and modification
0055 follow.
0056 
0057 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0058 
0059 0. This License applies to any program or other work which contains a notice
0060 placed by the copyright holder saying it may be distributed under the terms
0061 of this General Public License. The "Program", below, refers to any such program
0062 or work, and a "work based on the Program" means either the Program or any
0063 derivative work under copyright law: that is to say, a work containing the
0064 Program or a portion of it, either verbatim or with modifications and/or translated
0065 into another language. (Hereinafter, translation is included without limitation
0066 in the term "modification".) Each licensee is addressed as "you".
0067 
0068 Activities other than copying, distribution and modification are not covered
0069 by this License; they are outside its scope. The act of running the Program
0070 is not restricted, and the output from the Program is covered only if its
0071 contents constitute a work based on the Program (independent of having been
0072 made by running the Program). Whether that is true depends on what the Program
0073 does.
0074 
0075 1. You may copy and distribute verbatim copies of the Program's source code
0076 as you receive it, in any medium, provided that you conspicuously and appropriately
0077 publish on each copy an appropriate copyright notice and disclaimer of warranty;
0078 keep intact all the notices that refer to this License and to the absence
0079 of any warranty; and give any other recipients of the Program a copy of this
0080 License along with the Program.
0081 
0082 You may charge a fee for the physical act of transferring a copy, and you
0083 may at your option offer warranty protection in exchange for a fee.
0084 
0085 2. You may modify your copy or copies of the Program or any portion of it,
0086 thus forming a work based on the Program, and copy and distribute such modifications
0087 or work under the terms of Section 1 above, provided that you also meet all
0088 of these conditions:
0089 
0090 a) You must cause the modified files to carry prominent notices stating that
0091 you changed the files and the date of any change.
0092 
0093 b) You must cause any work that you distribute or publish, that in whole or
0094 in part contains or is derived from the Program or any part thereof, to be
0095 licensed as a whole at no charge to all third parties under the terms of this
0096 License.
0097 
0098 c) If the modified program normally reads commands interactively when run,
0099 you must cause it, when started running for such interactive use in the most
0100 ordinary way, to print or display an announcement including an appropriate
0101 copyright notice and a notice that there is no warranty (or else, saying that
0102 you provide a warranty) and that users may redistribute the program under
0103 these conditions, and telling the user how to view a copy of this License.
0104 (Exception: if the Program itself is interactive but does not normally print
0105 such an announcement, your work based on the Program is not required to print
0106 an announcement.)
0107 
0108 These requirements apply to the modified work as a whole. If identifiable
0109 sections of that work are not derived from the Program, and can be reasonably
0110 considered independent and separate works in themselves, then this License,
0111 and its terms, do not apply to those sections when you distribute them as
0112 separate works. But when you distribute the same sections as part of a whole
0113 which is a work based on the Program, the distribution of the whole must be
0114 on the terms of this License, whose permissions for other licensees extend
0115 to the entire whole, and thus to each and every part regardless of who wrote
0116 it.
0117 
0118 Thus, it is not the intent of this section to claim rights or contest your
0119 rights to work written entirely by you; rather, the intent is to exercise
0120 the right to control the distribution of derivative or collective works based
0121 on the Program.
0122 
0123 In addition, mere aggregation of another work not based on the Program with
0124 the Program (or with a work based on the Program) on a volume of a storage
0125 or distribution medium does not bring the other work under the scope of this
0126 License.
0127 
0128 3. You may copy and distribute the Program (or a work based on it, under Section
0129 2) in object code or executable form under the terms of Sections 1 and 2 above
0130 provided that you also do one of the following:
0131 
0132 a) Accompany it with the complete corresponding machine-readable source code,
0133 which must be distributed under the terms of Sections 1 and 2 above on a medium
0134 customarily used for software interchange; or,
0135 
0136 b) Accompany it with a written offer, valid for at least three years, to give
0137 any third party, for a charge no more than your cost of physically performing
0138 source distribution, a complete machine-readable copy of the corresponding
0139 source code, to be distributed under the terms of Sections 1 and 2 above on
0140 a medium customarily used for software interchange; or,
0141 
0142 c) Accompany it with the information you received as to the offer to distribute
0143 corresponding source code. (This alternative is allowed only for noncommercial
0144 distribution and only if you received the program in object code or executable
0145 form with such an offer, in accord with Subsection b above.)
0146 
0147 The source code for a work means the preferred form of the work for making
0148 modifications to it. For an executable work, complete source code means all
0149 the source code for all modules it contains, plus any associated interface
0150 definition files, plus the scripts used to control compilation and installation
0151 of the executable. However, as a special exception, the source code distributed
0152 need not include anything that is normally distributed (in either source or
0153 binary form) with the major components (compiler, kernel, and so on) of the
0154 operating system on which the executable runs, unless that component itself
0155 accompanies the executable.
0156 
0157 If distribution of executable or object code is made by offering access to
0158 copy from a designated place, then offering equivalent access to copy the
0159 source code from the same place counts as distribution of the source code,
0160 even though third parties are not compelled to copy the source along with
0161 the object code.
0162 
0163 4. You may not copy, modify, sublicense, or distribute the Program except
0164 as expressly provided under this License. Any attempt otherwise to copy, modify,
0165 sublicense or distribute the Program is void, and will automatically terminate
0166 your rights under this License. However, parties who have received copies,
0167 or rights, from you under this License will not have their licenses terminated
0168 so long as such parties remain in full compliance.
0169 
0170 5. You are not required to accept this License, since you have not signed
0171 it. However, nothing else grants you permission to modify or distribute the
0172 Program or its derivative works. These actions are prohibited by law if you
0173 do not accept this License. Therefore, by modifying or distributing the Program
0174 (or any work based on the Program), you indicate your acceptance of this License
0175 to do so, and all its terms and conditions for copying, distributing or modifying
0176 the Program or works based on it.
0177 
0178 6. Each time you redistribute the Program (or any work based on the Program),
0179 the recipient automatically receives a license from the original licensor
0180 to copy, distribute or modify the Program subject to these terms and conditions.
0181 You may not impose any further restrictions on the recipients' exercise of
0182 the rights granted herein. You are not responsible for enforcing compliance
0183 by third parties to this License.
0184 
0185 7. If, as a consequence of a court judgment or allegation of patent infringement
0186 or for any other reason (not limited to patent issues), conditions are imposed
0187 on you (whether by court order, agreement or otherwise) that contradict the
0188 conditions of this License, they do not excuse you from the conditions of
0189 this License. If you cannot distribute so as to satisfy simultaneously your
0190 obligations under this License and any other pertinent obligations, then as
0191 a consequence you may not distribute the Program at all. For example, if a
0192 patent license would not permit royalty-free redistribution of the Program
0193 by all those who receive copies directly or indirectly through you, then the
0194 only way you could satisfy both it and this License would be to refrain entirely
0195 from distribution of the Program.
0196 
0197 If any portion of this section is held invalid or unenforceable under any
0198 particular circumstance, the balance of the section is intended to apply and
0199 the section as a whole is intended to apply in other circumstances.
0200 
0201 It is not the purpose of this section to induce you to infringe any patents
0202 or other property right claims or to contest validity of any such claims;
0203 this section has the sole purpose of protecting the integrity of the free
0204 software distribution system, which is implemented by public license practices.
0205 Many people have made generous contributions to the wide range of software
0206 distributed through that system in reliance on consistent application of that
0207 system; it is up to the author/donor to decide if he or she is willing to
0208 distribute software through any other system and a licensee cannot impose
0209 that choice.
0210 
0211 This section is intended to make thoroughly clear what is believed to be a
0212 consequence of the rest of this License.
0213 
0214 8. If the distribution and/or use of the Program is restricted in certain
0215 countries either by patents or by copyrighted interfaces, the original copyright
0216 holder who places the Program under this License may add an explicit geographical
0217 distribution limitation excluding those countries, so that distribution is
0218 permitted only in or among countries not thus excluded. In such case, this
0219 License incorporates the limitation as if written in the body of this License.
0220 
0221 9. The Free Software Foundation may publish revised and/or new versions of
0222 the General Public License from time to time. Such new versions will be similar
0223 in spirit to the present version, but may differ in detail to address new
0224 problems or concerns.
0225 
0226 Each version is given a distinguishing version number. If the Program specifies
0227 a version number of this License which applies to it and "any later version",
0228 you have the option of following the terms and conditions either of that version
0229 or of any later version published by the Free Software Foundation. If the
0230 Program does not specify a version number of this License, you may choose
0231 any version ever published by the Free Software Foundation.
0232 
0233 10. If you wish to incorporate parts of the Program into other free programs
0234 whose distribution conditions are different, write to the author to ask for
0235 permission. For software which is copyrighted by the Free Software Foundation,
0236 write to the Free Software Foundation; we sometimes make exceptions for this.
0237 Our decision will be guided by the two goals of preserving the free status
0238 of all derivatives of our free software and of promoting the sharing and reuse
0239 of software generally.
0240 
0241 NO WARRANTY
0242 
0243 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR
0244 THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
0245 STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM
0246 "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
0247 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
0248 FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
0249 OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
0250 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
0251 
0252 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
0253 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE
0254 THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
0255 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE
0256 OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA
0257 OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES
0258 OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH
0259 HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
0260 
0261 END OF TERMS AND CONDITIONS
0262 
0263 How to Apply These Terms to Your New Programs
0264 
0265 If you develop a new program, and you want it to be of the greatest possible
0266 use to the public, the best way to achieve this is to make it free software
0267 which everyone can redistribute and change under these terms.
0268 
0269 To do so, attach the following notices to the program. It is safest to attach
0270 them to the start of each source file to most effectively convey the exclusion
0271 of warranty; and each file should have at least the "copyright" line and a
0272 pointer to where the full notice is found.
0273 
0274 one line to give the program's name and an idea of what it does. Copyright
0275 (C) yyyy name of author
0276 
0277 This program is free software; you can redistribute it and/or modify it under
0278 the terms of the GNU General Public License as published by the Free Software
0279 Foundation; either version 2 of the License, or (at your option) any later
0280 version.
0281 
0282 This program is distributed in the hope that it will be useful, but WITHOUT
0283 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
0284 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
0285 
0286 You should have received a copy of the GNU General Public License along with
0287 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
0288 Street, Fifth Floor, Boston, MA 02110-1301, USA. Also add information on how
0289 to contact you by electronic and paper mail.
0290 
0291 If the program is interactive, make it output a short notice like this when
0292 it starts in an interactive mode:
0293 
0294 Gnomovision version 69, Copyright (C) year name of author Gnomovision comes
0295 with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software,
0296 and you are welcome to redistribute it under certain conditions; type `show
0297 c' for details.
0298 
0299 The hypothetical commands `show w' and `show c' should show the appropriate
0300 parts of the General Public License. Of course, the commands you use may be
0301 called something other than `show w' and `show c'; they could even be mouse-clicks
0302 or menu items--whatever suits your program.
0303 
0304 You should also get your employer (if you work as a programmer) or your school,
0305 if any, to sign a "copyright disclaimer" for the program, if necessary. Here
0306 is a sample; alter the names:
0307 
0308 Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision'
0309 (which makes passes at compilers) written by James Hacker.
0310 
0311 signature of Ty Coon, 1 April 1989 Ty Coon, President of Vice