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   8 <h3><a id="SEC1">GNU GENERAL PUBLIC LICENSE</a></h3>
   9 <p>
  10 Version 2, June 1991
  11 </p>
  12
  13 <pre>Copyright (C) 1989, 1991 Free Software Foundation, Inc.
  14 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  15
  16 Everyone is permitted to copy and distribute verbatim copies
  17 of this license document, but changing it is not allowed.
  18 </pre>
  19
  20 <h3><a id="preamble"></a><a id="SEC2">Preamble</a></h3>
  21
  22 <p>
  23   The licenses for most software are designed to take away your
  24 freedom to share and change it.  By contrast, the GNU General Public
  25 License is intended to guarantee your freedom to share and change free
  26 software--to make sure the software is free for all its users.  This
  27 General Public License applies to most of the Free Software
  28 Foundation's software and to any other program whose authors commit to
  29 using it.  (Some other Free Software Foundation software is covered by
  30 the GNU Lesser General Public License instead.)  You can apply it to
  31 your programs, too.
  32 </p>
  33
  34 <p>
  35   When we speak of free software, we are referring to freedom, not
  36 price.  Our General Public Licenses are designed to make sure that you
  37 have the freedom to distribute copies of free software (and charge for
  38 this service if you wish), that you receive source code or can get it
  39 if you want it, that you can change the software or use pieces of it
  40 in new free programs; and that you know you can do these things.
  41 </p>
  42
  43 <p>
  44   To protect your rights, we need to make restrictions that forbid
  45 anyone to deny you these rights or to ask you to surrender the rights.
  46 These restrictions translate to certain responsibilities for you if you
  47 distribute copies of the software, or if you modify it.
  48 </p>
  49
  50 <p>
  51   For example, if you distribute copies of such a program, whether
  52 gratis or for a fee, you must give the recipients all the rights that
  53 you have.  You must make sure that they, too, receive or can get the
  54 source code.  And you must show them these terms so they know their
  55 rights.
  56 </p>
  57
  58 <p>
  59   We protect your rights with two steps: (1) copyright the software, and
  60 (2) offer you this license which gives you legal permission to copy,
  61 distribute and/or modify the software.
  62 </p>
  63
  64 <p>
  65   Also, for each author's protection and ours, we want to make certain
  66 that everyone understands that there is no warranty for this free
  67 software.  If the software is modified by someone else and passed on, we
  68 want its recipients to know that what they have is not the original, so
  69 that any problems introduced by others will not reflect on the original
  70 authors' reputations.
  71 </p>
  72
  73 <p>
  74   Finally, any free program is threatened constantly by software
  75 patents.  We wish to avoid the danger that redistributors of a free
  76 program will individually obtain patent licenses, in effect making the
  77 program proprietary.  To prevent this, we have made it clear that any
  78 patent must be licensed for everyone's free use or not licensed at all.
  79 </p>
  80
  81 <p>
  82   The precise terms and conditions for copying, distribution and
  83 modification follow.
  84 </p>
  85
  86
  87 <h3><a id="terms"></a><a id="SEC3">TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</a></h3>
  88
  89
  90 <a id="section0"></a><p>
  91 <strong>0.</strong>
  92  This License applies to any program or other work which contains
  93 a notice placed by the copyright holder saying it may be distributed
  94 under the terms of this General Public License.  The "Program", below,
  95 refers to any such program or work, and a "work based on the Program"
  96 means either the Program or any derivative work under copyright law:
  97 that is to say, a work containing the Program or a portion of it,
  98 either verbatim or with modifications and/or translated into another
  99 language.  (Hereinafter, translation is included without limitation in
 100 the term "modification".)  Each licensee is addressed as "you".
 101 </p>
 102
 103 <p>
 104 Activities other than copying, distribution and modification are not
 105 covered by this License; they are outside its scope.  The act of
 106 running the Program is not restricted, and the output from the Program
 107 is covered only if its contents constitute a work based on the
 108 Program (independent of having been made by running the Program).
 109 Whether that is true depends on what the Program does.
 110 </p>
 111
 112 <a id="section1"></a><p>
 113 <strong>1.</strong>
 114  You may copy and distribute verbatim copies of the Program's
 115 source code as you receive it, in any medium, provided that you
 116 conspicuously and appropriately publish on each copy an appropriate
 117 copyright notice and disclaimer of warranty; keep intact all the
 118 notices that refer to this License and to the absence of any warranty;
 119 and give any other recipients of the Program a copy of this License
 120 along with the Program.
 121 </p>
 122
 123 <p>
 124 You may charge a fee for the physical act of transferring a copy, and
 125 you may at your option offer warranty protection in exchange for a fee.
 126 </p>
 127
 128 <a id="section2"></a><p>
 129 <strong>2.</strong>
 130  You may modify your copy or copies of the Program or any portion
 131 of it, thus forming a work based on the Program, and copy and
 132 distribute such modifications or work under the terms of Section 1
 133 above, provided that you also meet all of these conditions:
 134 </p>
 135
 136 <dl>
 137   <dt></dt>
 138     <dd>
 139       <strong>a)</strong>
 140       You must cause the modified files to carry prominent notices
 141       stating that you changed the files and the date of any change.
 142     </dd>
 143   <dt></dt>
 144     <dd>
 145       <strong>b)</strong>
 146       You must cause any work that you distribute or publish, that in
 147       whole or in part contains or is derived from the Program or any
 148       part thereof, to be licensed as a whole at no charge to all third
 149       parties under the terms of this License.
 150     </dd>
 151   <dt></dt>
 152     <dd>
 153       <strong>c)</strong>
 154       If the modified program normally reads commands interactively
 155       when run, you must cause it, when started running for such
 156       interactive use in the most ordinary way, to print or display an
 157       announcement including an appropriate copyright notice and a
 158       notice that there is no warranty (or else, saying that you provide
 159       a warranty) and that users may redistribute the program under
 160       these conditions, and telling the user how to view a copy of this
 161       License.  (Exception: if the Program itself is interactive but
 162       does not normally print such an announcement, your work based on
 163       the Program is not required to print an announcement.)
 164     </dd>
 165 </dl>
 166
 167 <p>
 168 These requirements apply to the modified work as a whole.  If
 169 identifiable sections of that work are not derived from the Program,
 170 and can be reasonably considered independent and separate works in
 171 themselves, then this License, and its terms, do not apply to those
 172 sections when you distribute them as separate works.  But when you
 173 distribute the same sections as part of a whole which is a work based
 174 on the Program, the distribution of the whole must be on the terms of
 175 this License, whose permissions for other licensees extend to the
 176 entire whole, and thus to each and every part regardless of who wrote it.
 177 </p>
 178
 179 <p>
 180 Thus, it is not the intent of this section to claim rights or contest
 181 your rights to work written entirely by you; rather, the intent is to
 182 exercise the right to control the distribution of derivative or
 183 collective works based on the Program.
 184 </p>
 185
 186 <p>
 187 In addition, mere aggregation of another work not based on the Program
 188 with the Program (or with a work based on the Program) on a volume of
 189 a storage or distribution medium does not bring the other work under
 190 the scope of this License.
 191 </p>
 192
 193 <a id="section3"></a><p>
 194 <strong>3.</strong>
 195  You may copy and distribute the Program (or a work based on it,
 196 under Section 2) in object code or executable form under the terms of
 197 Sections 1 and 2 above provided that you also do one of the following:
 198 </p>
 199
 200 <!-- we use this doubled UL to get the sub-sections indented, -->
 201 <!-- while making the bullets as unobvious as possible. -->
 202
 203 <dl>
 204   <dt></dt>
 205     <dd>
 206       <strong>a)</strong>
 207       Accompany it with the complete corresponding machine-readable
 208       source code, which must be distributed under the terms of Sections
 209       1 and 2 above on a medium customarily used for software interchange; or,
 210     </dd>
 211   <dt></dt>
 212     <dd>
 213       <strong>b)</strong>
 214       Accompany it with a written offer, valid for at least three
 215       years, to give any third party, for a charge no more than your
 216       cost of physically performing source distribution, a complete
 217       machine-readable copy of the corresponding source code, to be
 218       distributed under the terms of Sections 1 and 2 above on a medium
 219       customarily used for software interchange; or,
 220     </dd>
 221   <dt></dt>
 222     <dd>
 223       <strong>c)</strong>
 224       Accompany it with the information you received as to the offer
 225       to distribute corresponding source code.  (This alternative is
 226       allowed only for noncommercial distribution and only if you
 227       received the program in object code or executable form with such
 228       an offer, in accord with Subsection b above.)
 229     </dd>
 230 </dl>
 231
 232 <p>
 233 The source code for a work means the preferred form of the work for
 234 making modifications to it.  For an executable work, complete source
 235 code means all the source code for all modules it contains, plus any
 236 associated interface definition files, plus the scripts used to
 237 control compilation and installation of the executable.  However, as a
 238 special exception, the source code distributed need not include
 239 anything that is normally distributed (in either source or binary
 240 form) with the major components (compiler, kernel, and so on) of the
 241 operating system on which the executable runs, unless that component
 242 itself accompanies the executable.
 243 </p>
 244
 245 <p>
 246 If distribution of executable or object code is made by offering
 247 access to copy from a designated place, then offering equivalent
 248 access to copy the source code from the same place counts as
 249 distribution of the source code, even though third parties are not
 250 compelled to copy the source along with the object code.
 251 </p>
 252
 253 <a id="section4"></a><p>
 254 <strong>4.</strong>
 255  You may not copy, modify, sublicense, or distribute the Program
 256 except as expressly provided under this License.  Any attempt
 257 otherwise to copy, modify, sublicense or distribute the Program is
 258 void, and will automatically terminate your rights under this License.
 259 However, parties who have received copies, or rights, from you under
 260 this License will not have their licenses terminated so long as such
 261 parties remain in full compliance.
 262 </p>
 263
 264 <a id="section5"></a><p>
 265 <strong>5.</strong>
 266  You are not required to accept this License, since you have not
 267 signed it.  However, nothing else grants you permission to modify or
 268 distribute the Program or its derivative works.  These actions are
 269 prohibited by law if you do not accept this License.  Therefore, by
 270 modifying or distributing the Program (or any work based on the
 271 Program), you indicate your acceptance of this License to do so, and
 272 all its terms and conditions for copying, distributing or modifying
 273 the Program or works based on it.
 274 </p>
 275
 276 <a id="section6"></a><p>
 277 <strong>6.</strong>
 278  Each time you redistribute the Program (or any work based on the
 279 Program), the recipient automatically receives a license from the
 280 original licensor to copy, distribute or modify the Program subject to
 281 these terms and conditions.  You may not impose any further
 282 restrictions on the recipients' exercise of the rights granted herein.
 283 You are not responsible for enforcing compliance by third parties to
 284 this License.
 285 </p>
 286
 287 <a id="section7"></a><p>
 288 <strong>7.</strong>
 289  If, as a consequence of a court judgment or allegation of patent
 290 infringement or for any other reason (not limited to patent issues),
 291 conditions are imposed on you (whether by court order, agreement or
 292 otherwise) that contradict the conditions of this License, they do not
 293 excuse you from the conditions of this License.  If you cannot
 294 distribute so as to satisfy simultaneously your obligations under this
 295 License and any other pertinent obligations, then as a consequence you
 296 may not distribute the Program at all.  For example, if a patent
 297 license would not permit royalty-free redistribution of the Program by
 298 all those who receive copies directly or indirectly through you, then
 299 the only way you could satisfy both it and this License would be to
 300 refrain entirely from distribution of the Program.
 301 </p>
 302
 303 <p>
 304 If any portion of this section is held invalid or unenforceable under
 305 any particular circumstance, the balance of the section is intended to
 306 apply and the section as a whole is intended to apply in other
 307 circumstances.
 308 </p>
 309
 310 <p>
 311 It is not the purpose of this section to induce you to infringe any
 312 patents or other property right claims or to contest validity of any
 313 such claims; this section has the sole purpose of protecting the
 314 integrity of the free software distribution system, which is
 315 implemented by public license practices.  Many people have made
 316 generous contributions to the wide range of software distributed
 317 through that system in reliance on consistent application of that
 318 system; it is up to the author/donor to decide if he or she is willing
 319 to distribute software through any other system and a licensee cannot
 320 impose that choice.
 321 </p>
 322
 323 <p>
 324 This section is intended to make thoroughly clear what is believed to
 325 be a consequence of the rest of this License.
 326 </p>
 327
 328 <a id="section8"></a><p>
 329 <strong>8.</strong>
 330  If the distribution and/or use of the Program is restricted in
 331 certain countries either by patents or by copyrighted interfaces, the
 332 original copyright holder who places the Program under this License
 333 may add an explicit geographical distribution limitation excluding
 334 those countries, so that distribution is permitted only in or among
 335 countries not thus excluded.  In such case, this License incorporates
 336 the limitation as if written in the body of this License.
 337 </p>
 338
 339 <a id="section9"></a><p>
 340 <strong>9.</strong>
 341  The Free Software Foundation may publish revised and/or new versions
 342 of the General Public License from time to time.  Such new versions will
 343 be similar in spirit to the present version, but may differ in detail to
 344 address new problems or concerns.
 345 </p>
 346
 347 <p>
 348 Each version is given a distinguishing version number.  If the Program
 349 specifies a version number of this License which applies to it and "any
 350 later version", you have the option of following the terms and conditions
 351 either of that version or of any later version published by the Free
 352 Software Foundation.  If the Program does not specify a version number of
 353 this License, you may choose any version ever published by the Free Software
 354 Foundation.
 355 </p>
 356
 357 <a id="section10"></a><p>
 358 <strong>10.</strong>
 359  If you wish to incorporate parts of the Program into other free
 360 programs whose distribution conditions are different, write to the author
 361 to ask for permission.  For software which is copyrighted by the Free
 362 Software Foundation, write to the Free Software Foundation; we sometimes
 363 make exceptions for this.  Our decision will be guided by the two goals
 364 of preserving the free status of all derivatives of our free software and
 365 of promoting the sharing and reuse of software generally.
 366 </p>
 367
 368 <a id="section11"></a><p><strong>NO WARRANTY</strong></p>
 369
 370 <p>
 371 <strong>11.</strong>
 372  BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 373 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 374 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 375 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 376 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 377 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 378 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 379 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 380 REPAIR OR CORRECTION.
 381 </p>
 382
 383 <a id="section12"></a><p>
 384 <strong>12.</strong>
 385  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 386 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 387 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 388 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 389 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 390 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 391 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 392 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 393 POSSIBILITY OF SUCH DAMAGES.
 394 </p>
 395
 396 <h3>END OF TERMS AND CONDITIONS</h3>
 397
 398 <h3><a id="howto"></a><a id="SEC4">How to Apply These Terms to Your New Programs</a></h3>
 399
 400 <p>
 401   If you develop a new program, and you want it to be of the greatest
 402 possible use to the public, the best way to achieve this is to make it
 403 free software which everyone can redistribute and change under these terms.
 404 </p>
 405
 406 <p>
 407   To do so, attach the following notices to the program.  It is safest
 408 to attach them to the start of each source file to most effectively
 409 convey the exclusion of warranty; and each file should have at least
 410 the "copyright" line and a pointer to where the full notice is found.
 411 </p>
 412
 413 <pre><var>one line to give the program's name and an idea of what it does.</var>
 414 Copyright (C) <var>yyyy</var>  <var>name of author</var>
 415
 416 This program is free software; you can redistribute it and/or
 417 modify it under the terms of the GNU General Public License
 418 as published by the Free Software Foundation; either version 2
 419 of the License, or (at your option) any later version.
 420
 421 This program is distributed in the hope that it will be useful,
 422 but WITHOUT ANY WARRANTY; without even the implied warranty of
 423 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 424 GNU General Public License for more details.
 425
 426 You should have received a copy of the GNU General Public License
 427 along with this program; if not, write to the Free Software
 428 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 429 </pre>
 430
 431 <p>
 432 Also add information on how to contact you by electronic and paper mail.
 433 </p>
 434
 435 <p>
 436 If the program is interactive, make it output a short notice like this
 437 when it starts in an interactive mode:
 438 </p>
 439
 440 <pre>Gnomovision version 69, Copyright (C) <var>year</var> <var>name of author</var>
 441 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
 442 type `show w'.  This is free software, and you are welcome
 443 to redistribute it under certain conditions; type `show c'
 444 for details.
 445 </pre>
 446
 447 <p>
 448 The hypothetical commands <samp>`show w'</samp> and <samp>`show c'</samp> should show
 449 the appropriate parts of the General Public License.  Of course, the
 450 commands you use may be called something other than <samp>`show w'</samp> and
 451 <samp>`show c'</samp>; they could even be mouse-clicks or menu items--whatever
 452 suits your program.
 453 </p>
 454
 455 <p>
 456 You should also get your employer (if you work as a programmer) or your
 457 school, if any, to sign a "copyright disclaimer" for the program, if
 458 necessary.  Here is a sample; alter the names:
 459 </p>
 460
 461
 462 <pre>Yoyodyne, Inc., hereby disclaims all copyright
 463 interest in the program `Gnomovision'
 464 (which makes passes at compilers) written
 465 by James Hacker.
 466
 467 <var>signature of Ty Coon</var>, 1 April 1989
 468 Ty Coon, President of Vice
 469 </pre>
 470
 471 <p>
 472 This General Public License does not permit incorporating your program into
 473 proprietary programs.  If your program is a subroutine library, you may
 474 consider it more useful to permit linking proprietary applications with the
 475 library.  If this is what you want to do, use the
 476 <a href="http://www.gnu.org/licenses/lgpl.html">GNU Lesser General Public License</a>
 477 instead of this License.
 478 </p>
 479
 480
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