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| 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 |  | 
| 12 freedom to share and change it.  By contrast, the GNU General Public |  | 
| 13 License is intended to guarantee your freedom to share and change free |  | 
| 14 software--to make sure the software is free for all its users.  This |  | 
| 15 General Public License applies to most of the Free Software |  | 
| 16 Foundation's software and to any other program whose authors commit to |  | 
| 17 using it.  (Some other Free Software Foundation software is covered by |  | 
| 18 the GNU Lesser General Public License instead.)  You can apply it to |  | 
| 19 your programs, too. |  | 
| 20 |  | 
| 21   When we speak of free software, we are referring to freedom, not |  | 
| 22 price.  Our General Public Licenses are designed to make sure that you |  | 
| 23 have the freedom to distribute copies of free software (and charge for |  | 
| 24 this service if you wish), that you receive source code or can get it |  | 
| 25 if you want it, that you can change the software or use pieces of it |  | 
| 26 in 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 |  | 
| 29 anyone to deny you these rights or to ask you to surrender the rights. |  | 
| 30 These restrictions translate to certain responsibilities for you if you |  | 
| 31 distribute copies of the software, or if you modify it. |  | 
| 32 |  | 
| 33   For example, if you distribute copies of such a program, whether |  | 
| 34 gratis or for a fee, you must give the recipients all the rights that |  | 
| 35 you have.  You must make sure that they, too, receive or can get the |  | 
| 36 source code.  And you must show them these terms so they know their |  | 
| 37 rights. |  | 
| 38 |  | 
| 39   We protect your rights with two steps: (1) copyright the software, and |  | 
| 40 (2) offer you this license which gives you legal permission to copy, |  | 
| 41 distribute and/or modify the software. |  | 
| 42 |  | 
| 43   Also, for each author's protection and ours, we want to make certain |  | 
| 44 that everyone understands that there is no warranty for this free |  | 
| 45 software.  If the software is modified by someone else and passed on, we |  | 
| 46 want its recipients to know that what they have is not the original, so |  | 
| 47 that any problems introduced by others will not reflect on the original |  | 
| 48 authors' reputations. |  | 
| 49 |  | 
| 50   Finally, any free program is threatened constantly by software |  | 
| 51 patents.  We wish to avoid the danger that redistributors of a free |  | 
| 52 program will individually obtain patent licenses, in effect making the |  | 
| 53 program proprietary.  To prevent this, we have made it clear that any |  | 
| 54 patent must be licensed for everyone's free use or not licensed at all. |  | 
| 55 |  | 
| 56   The precise terms and conditions for copying, distribution and |  | 
| 57 modification follow. |  | 
| 58 |  | 
| 59                     GNU GENERAL PUBLIC LICENSE |  | 
| 60    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION |  | 
| 61 |  | 
| 62   0. This License applies to any program or other work which contains |  | 
| 63 a notice placed by the copyright holder saying it may be distributed |  | 
| 64 under the terms of this General Public License.  The "Program", below, |  | 
| 65 refers to any such program or work, and a "work based on the Program" |  | 
| 66 means either the Program or any derivative work under copyright law: |  | 
| 67 that is to say, a work containing the Program or a portion of it, |  | 
| 68 either verbatim or with modifications and/or translated into another |  | 
| 69 language.  (Hereinafter, translation is included without limitation in |  | 
| 70 the term "modification".)  Each licensee is addressed as "you". |  | 
| 71 |  | 
| 72 Activities other than copying, distribution and modification are not |  | 
| 73 covered by this License; they are outside its scope.  The act of |  | 
| 74 running the Program is not restricted, and the output from the Program |  | 
| 75 is covered only if its contents constitute a work based on the |  | 
| 76 Program (independent of having been made by running the Program). |  | 
| 77 Whether that is true depends on what the Program does. |  | 
| 78 |  | 
| 79   1. You may copy and distribute verbatim copies of the Program's |  | 
| 80 source code as you receive it, in any medium, provided that you |  | 
| 81 conspicuously and appropriately publish on each copy an appropriate |  | 
| 82 copyright notice and disclaimer of warranty; keep intact all the |  | 
| 83 notices that refer to this License and to the absence of any warranty; |  | 
| 84 and give any other recipients of the Program a copy of this License |  | 
| 85 along with the Program. |  | 
| 86 |  | 
| 87 You may charge a fee for the physical act of transferring a copy, and |  | 
| 88 you may at your option offer warranty protection in exchange for a fee. |  | 
| 89 |  | 
| 90   2. You may modify your copy or copies of the Program or any portion |  | 
| 91 of it, thus forming a work based on the Program, and copy and |  | 
| 92 distribute such modifications or work under the terms of Section 1 |  | 
| 93 above, provided that you also meet all of these conditions: |  | 
| 94 |  | 
| 95     a) You must cause the modified files to carry prominent notices |  | 
| 96     stating that you changed the files and the date of any change. |  | 
| 97 |  | 
| 98     b) You must cause any work that you distribute or publish, that in |  | 
| 99     whole or in part contains or is derived from the Program or any |  | 
| 100     part thereof, to be licensed as a whole at no charge to all third |  | 
| 101     parties under the terms of this License. |  | 
| 102 |  | 
| 103     c) If the modified program normally reads commands interactively |  | 
| 104     when run, you must cause it, when started running for such |  | 
| 105     interactive use in the most ordinary way, to print or display an |  | 
| 106     announcement including an appropriate copyright notice and a |  | 
| 107     notice that there is no warranty (or else, saying that you provide |  | 
| 108     a warranty) and that users may redistribute the program under |  | 
| 109     these conditions, and telling the user how to view a copy of this |  | 
| 110     License.  (Exception: if the Program itself is interactive but |  | 
| 111     does not normally print such an announcement, your work based on |  | 
| 112     the Program is not required to print an announcement.) |  | 
| 113 |  | 
| 114 These requirements apply to the modified work as a whole.  If |  | 
| 115 identifiable sections of that work are not derived from the Program, |  | 
| 116 and can be reasonably considered independent and separate works in |  | 
| 117 themselves, then this License, and its terms, do not apply to those |  | 
| 118 sections when you distribute them as separate works.  But when you |  | 
| 119 distribute the same sections as part of a whole which is a work based |  | 
| 120 on the Program, the distribution of the whole must be on the terms of |  | 
| 121 this License, whose permissions for other licensees extend to the |  | 
| 122 entire whole, and thus to each and every part regardless of who wrote it. |  | 
| 123 |  | 
| 124 Thus, it is not the intent of this section to claim rights or contest |  | 
| 125 your rights to work written entirely by you; rather, the intent is to |  | 
| 126 exercise the right to control the distribution of derivative or |  | 
| 127 collective works based on the Program. |  | 
| 128 |  | 
| 129 In addition, mere aggregation of another work not based on the Program |  | 
| 130 with the Program (or with a work based on the Program) on a volume of |  | 
| 131 a storage or distribution medium does not bring the other work under |  | 
| 132 the scope of this License. |  | 
| 133 |  | 
| 134   3. You may copy and distribute the Program (or a work based on it, |  | 
| 135 under Section 2) in object code or executable form under the terms of |  | 
| 136 Sections 1 and 2 above provided that you also do one of the following: |  | 
| 137 |  | 
| 138     a) Accompany it with the complete corresponding machine-readable |  | 
| 139     source code, which must be distributed under the terms of Sections |  | 
| 140     1 and 2 above on a medium customarily used for software interchange; or, |  | 
| 141 |  | 
| 142     b) Accompany it with a written offer, valid for at least three |  | 
| 143     years, to give any third party, for a charge no more than your |  | 
| 144     cost of physically performing source distribution, a complete |  | 
| 145     machine-readable copy of the corresponding source code, to be |  | 
| 146     distributed under the terms of Sections 1 and 2 above on a medium |  | 
| 147     customarily used for software interchange; or, |  | 
| 148 |  | 
| 149     c) Accompany it with the information you received as to the offer |  | 
| 150     to distribute corresponding source code.  (This alternative is |  | 
| 151     allowed only for noncommercial distribution and only if you |  | 
| 152     received the program in object code or executable form with such |  | 
| 153     an offer, in accord with Subsection b above.) |  | 
| 154 |  | 
| 155 The source code for a work means the preferred form of the work for |  | 
| 156 making modifications to it.  For an executable work, complete source |  | 
| 157 code means all the source code for all modules it contains, plus any |  | 
| 158 associated interface definition files, plus the scripts used to |  | 
| 159 control compilation and installation of the executable.  However, as a |  | 
| 160 special exception, the source code distributed need not include |  | 
| 161 anything that is normally distributed (in either source or binary |  | 
| 162 form) with the major components (compiler, kernel, and so on) of the |  | 
| 163 operating system on which the executable runs, unless that component |  | 
| 164 itself accompanies the executable. |  | 
| 165 |  | 
| 166 If distribution of executable or object code is made by offering |  | 
| 167 access to copy from a designated place, then offering equivalent |  | 
| 168 access to copy the source code from the same place counts as |  | 
| 169 distribution of the source code, even though third parties are not |  | 
| 170 compelled to copy the source along with the object code. |  | 
| 171 |  | 
| 172   4. You may not copy, modify, sublicense, or distribute the Program |  | 
| 173 except as expressly provided under this License.  Any attempt |  | 
| 174 otherwise to copy, modify, sublicense or distribute the Program is |  | 
| 175 void, and will automatically terminate your rights under this License. |  | 
| 176 However, parties who have received copies, or rights, from you under |  | 
| 177 this License will not have their licenses terminated so long as such |  | 
| 178 parties remain in full compliance. |  | 
| 179 |  | 
| 180   5. You are not required to accept this License, since you have not |  | 
| 181 signed it.  However, nothing else grants you permission to modify or |  | 
| 182 distribute the Program or its derivative works.  These actions are |  | 
| 183 prohibited by law if you do not accept this License.  Therefore, by |  | 
| 184 modifying or distributing the Program (or any work based on the |  | 
| 185 Program), you indicate your acceptance of this License to do so, and |  | 
| 186 all its terms and conditions for copying, distributing or modifying |  | 
| 187 the Program or works based on it. |  | 
| 188 |  | 
| 189   6. Each time you redistribute the Program (or any work based on the |  | 
| 190 Program), the recipient automatically receives a license from the |  | 
| 191 original licensor to copy, distribute or modify the Program subject to |  | 
| 192 these terms and conditions.  You may not impose any further |  | 
| 193 restrictions on the recipients' exercise of the rights granted herein. |  | 
| 194 You are not responsible for enforcing compliance by third parties to |  | 
| 195 this License. |  | 
| 196 |  | 
| 197   7. If, as a consequence of a court judgment or allegation of patent |  | 
| 198 infringement or for any other reason (not limited to patent issues), |  | 
| 199 conditions are imposed on you (whether by court order, agreement or |  | 
| 200 otherwise) that contradict the conditions of this License, they do not |  | 
| 201 excuse you from the conditions of this License.  If you cannot |  | 
| 202 distribute so as to satisfy simultaneously your obligations under this |  | 
| 203 License and any other pertinent obligations, then as a consequence you |  | 
| 204 may not distribute the Program at all.  For example, if a patent |  | 
| 205 license would not permit royalty-free redistribution of the Program by |  | 
| 206 all those who receive copies directly or indirectly through you, then |  | 
| 207 the only way you could satisfy both it and this License would be to |  | 
| 208 refrain entirely from distribution of the Program. |  | 
| 209 |  | 
| 210 If any portion of this section is held invalid or unenforceable under |  | 
| 211 any particular circumstance, the balance of the section is intended to |  | 
| 212 apply and the section as a whole is intended to apply in other |  | 
| 213 circumstances. |  | 
| 214 |  | 
| 215 It is not the purpose of this section to induce you to infringe any |  | 
| 216 patents or other property right claims or to contest validity of any |  | 
| 217 such claims; this section has the sole purpose of protecting the |  | 
| 218 integrity of the free software distribution system, which is |  | 
| 219 implemented by public license practices.  Many people have made |  | 
| 220 generous contributions to the wide range of software distributed |  | 
| 221 through that system in reliance on consistent application of that |  | 
| 222 system; it is up to the author/donor to decide if he or she is willing |  | 
| 223 to distribute software through any other system and a licensee cannot |  | 
| 224 impose that choice. |  | 
| 225 |  | 
| 226 This section is intended to make thoroughly clear what is believed to |  | 
| 227 be a consequence of the rest of this License. |  | 
| 228 |  | 
| 229   8. If the distribution and/or use of the Program is restricted in |  | 
| 230 certain countries either by patents or by copyrighted interfaces, the |  | 
| 231 original copyright holder who places the Program under this License |  | 
| 232 may add an explicit geographical distribution limitation excluding |  | 
| 233 those countries, so that distribution is permitted only in or among |  | 
| 234 countries not thus excluded.  In such case, this License incorporates |  | 
| 235 the limitation as if written in the body of this License. |  | 
| 236 |  | 
| 237   9. The Free Software Foundation may publish revised and/or new versions |  | 
| 238 of the General Public License from time to time.  Such new versions will |  | 
| 239 be similar in spirit to the present version, but may differ in detail to |  | 
| 240 address new problems or concerns. |  | 
| 241 |  | 
| 242 Each version is given a distinguishing version number.  If the Program |  | 
| 243 specifies a version number of this License which applies to it and "any |  | 
| 244 later version", you have the option of following the terms and conditions |  | 
| 245 either of that version or of any later version published by the Free |  | 
| 246 Software Foundation.  If the Program does not specify a version number of |  | 
| 247 this License, you may choose any version ever published by the Free Software |  | 
| 248 Foundation. |  | 
| 249 |  | 
| 250   10. If you wish to incorporate parts of the Program into other free |  | 
| 251 programs whose distribution conditions are different, write to the author |  | 
| 252 to ask for permission.  For software which is copyrighted by the Free |  | 
| 253 Software Foundation, write to the Free Software Foundation; we sometimes |  | 
| 254 make exceptions for this.  Our decision will be guided by the two goals |  | 
| 255 of preserving the free status of all derivatives of our free software and |  | 
| 256 of 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 |  | 
| 261 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN |  | 
| 262 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES |  | 
| 263 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED |  | 
| 264 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |  | 
| 265 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS |  | 
| 266 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE |  | 
| 267 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, |  | 
| 268 REPAIR OR CORRECTION. |  | 
| 269 |  | 
| 270   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |  | 
| 271 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR |  | 
| 272 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, |  | 
| 273 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING |  | 
| 274 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED |  | 
| 275 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY |  | 
| 276 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER |  | 
| 277 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE |  | 
| 278 POSSIBILITY OF SUCH DAMAGES. |  | 
| 279 |  | 
| 280                      END OF TERMS AND CONDITIONS |  | 
| 281 |  | 
| 282             How to Apply These Terms to Your New Programs |  | 
| 283 |  | 
| 284   If you develop a new program, and you want it to be of the greatest |  | 
| 285 possible use to the public, the best way to achieve this is to make it |  | 
| 286 free software which everyone can redistribute and change under these terms. |  | 
| 287 |  | 
| 288   To do so, attach the following notices to the program.  It is safest |  | 
| 289 to attach them to the start of each source file to most effectively |  | 
| 290 convey the exclusion of warranty; and each file should have at least |  | 
| 291 the "copyright" line and a pointer to where the full notice is found. |  | 
| 292 |  | 
| 293     <one line to give the program's name and a brief idea of what it does.> |  | 
| 294     Copyright (C) <year>  <name of author> |  | 
| 295 |  | 
| 296     This program is free software; you can redistribute it and/or modify |  | 
| 297     it under the terms of the GNU General Public License as published by |  | 
| 298     the Free Software Foundation; either version 2 of the License, or |  | 
| 299     (at your option) any later version. |  | 
| 300 |  | 
| 301     This program is distributed in the hope that it will be useful, |  | 
| 302     but WITHOUT ANY WARRANTY; without even the implied warranty of |  | 
| 303     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the |  | 
| 304     GNU General Public License for more details. |  | 
| 305 |  | 
| 306     You should have received a copy of the GNU General Public License along |  | 
| 307     with this program; if not, write to the Free Software Foundation, Inc., |  | 
| 308     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |  | 
| 309 |  | 
| 310 Also add information on how to contact you by electronic and paper mail. |  | 
| 311 |  | 
| 312 If the program is interactive, make it output a short notice like this |  | 
| 313 when it starts in an interactive mode: |  | 
| 314 |  | 
| 315     Gnomovision version 69, Copyright (C) year name of author |  | 
| 316     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. |  | 
| 317     This is free software, and you are welcome to redistribute it |  | 
| 318     under certain conditions; type `show c' for details. |  | 
| 319 |  | 
| 320 The hypothetical commands `show w' and `show c' should show the appropriate |  | 
| 321 parts of the General Public License.  Of course, the commands you use may |  | 
| 322 be called something other than `show w' and `show c'; they could even be |  | 
| 323 mouse-clicks or menu items--whatever suits your program. |  | 
| 324 |  | 
| 325 You should also get your employer (if you work as a programmer) or your |  | 
| 326 school, if any, to sign a "copyright disclaimer" for the program, if |  | 
| 327 necessary.  Here is a sample; alter the names: |  | 
| 328 |  | 
| 329   Yoyodyne, Inc., hereby disclaims all copyright interest in the program |  | 
| 330   `Gnomovision' (which makes passes at compilers) written by James Hacker. |  | 
| 331 |  | 
| 332   <signature of Ty Coon>, 1 April 1989 |  | 
| 333   Ty Coon, President of Vice |  | 
| 334 |  | 
| 335 This General Public License does not permit incorporating your program into |  | 
| 336 proprietary programs.  If your program is a subroutine library, you may |  | 
| 337 consider it more useful to permit linking proprietary applications with the |  | 
| 338 library.  If this is what you want to do, use the GNU Lesser General |  | 
| 339 Public License instead of this License. |  | 
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