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  19 <h2 class="appendix">GNU GENERAL PUBLIC LICENSE</h2>
  20
  21 <div align="center">Version 2, June 1991</div>
  22 <pre class="display">     Copyright &copy; 1989, 1991 Free Software Foundation, Inc.
  23      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  24
  25      Everyone is permitted to copy and distribute verbatim copies
  26      of this license document, but changing it is not allowed.
  27      </pre>
  28
  29 <h3 class="unnumberedsec">Preamble</h3>
  30
  31    <p>The licenses for most software are designed to take away your
  32 freedom to share and change it.  By contrast, the GNU General Public
  33 License is intended to guarantee your freedom to share and change free
  34 software--to make sure the software is free for all its users.  This
  35 General Public License applies to most of the Free Software
  36 Foundation's software and to any other program whose authors commit to
  37 using it.  (Some other Free Software Foundation software is covered by
  38 the GNU Library General Public License instead.)  You can apply it to
  39 your programs, too.
  40
  41    <p>When we speak of free software, we are referring to freedom, not
  42 price.  Our General Public Licenses are designed to make sure that you
  43 have the freedom to distribute copies of free software (and charge for
  44 this service if you wish), that you receive source code or can get it
  45 if you want it, that you can change the software or use pieces of it
  46 in new free programs; and that you know you can do these things.
  47
  48    <p>To protect your rights, we need to make restrictions that forbid
  49 anyone to deny you these rights or to ask you to surrender the rights.
  50 These restrictions translate to certain responsibilities for you if you
  51 distribute copies of the software, or if you modify it.
  52
  53    <p>For example, if you distribute copies of such a program, whether
  54 gratis or for a fee, you must give the recipients all the rights that
  55 you have.  You must make sure that they, too, receive or can get the
  56 source code.  And you must show them these terms so they know their
  57 rights.
  58
  59    <p>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
  63    <p>Also, for each author's protection and ours, we want to make certain
  64 that everyone understands that there is no warranty for this free
  65 software.  If the software is modified by someone else and passed on, we
  66 want its recipients to know that what they have is not the original, so
  67 that any problems introduced by others will not reflect on the original
  68 authors' reputations.
  69
  70    <p>Finally, any free program is threatened constantly by software
  71 patents.  We wish to avoid the danger that redistributors of a free
  72 program will individually obtain patent licenses, in effect making the
  73 program proprietary.  To prevent this, we have made it clear that any
  74 patent must be licensed for everyone's free use or not licensed at all.
  75
  76    <p>The precise terms and conditions for copying, distribution and
  77 modification follow.
  78
  79 <div align="center">TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</div>
  80      <ol type=1 start=0>
  81 <li>This License applies to any program or other work which contains
  82 a notice placed by the copyright holder saying it may be distributed
  83 under the terms of this General Public License.  The "Program", below,
  84 refers to any such program or work, and a "work based on the Program"
  85 means either the Program or any derivative work under copyright law:
  86 that is to say, a work containing the Program or a portion of it,
  87 either verbatim or with modifications and/or translated into another
  88 language.  (Hereinafter, translation is included without limitation in
  89 the term "modification".)  Each licensee is addressed as "you".
  90
  91      <p>Activities other than copying, distribution and modification are not
  92 covered by this License; they are outside its scope.  The act of
  93 running the Program is not restricted, and the output from the Program
  94 is covered only if its contents constitute a work based on the
  95 Program (independent of having been made by running the Program).
  96 Whether that is true depends on what the Program does.
  97
  98      </p><li>You may copy and distribute verbatim copies of the Program's
  99 source code as you receive it, in any medium, provided that you
 100 conspicuously and appropriately publish on each copy an appropriate
 101 copyright notice and disclaimer of warranty; keep intact all the
 102 notices that refer to this License and to the absence of any warranty;
 103 and give any other recipients of the Program a copy of this License
 104 along with the Program.
 105
 106      <p>You may charge a fee for the physical act of transferring a copy, and
 107 you may at your option offer warranty protection in exchange for a fee.
 108
 109      </p><li>You may modify your copy or copies of the Program or any portion
 110 of it, thus forming a work based on the Program, and copy and
 111 distribute such modifications or work under the terms of Section 1
 112 above, provided that you also meet all of these conditions:
 113
 114           <ol type=a start=1>
 115 <li>You must cause the modified files to carry prominent notices
 116 stating that you changed the files and the date of any change.
 117
 118           <li>You must cause any work that you distribute or publish, that in
 119 whole or in part contains or is derived from the Program or any
 120 part thereof, to be licensed as a whole at no charge to all third
 121 parties under the terms of this License.
 122
 123           <li>If the modified program normally reads commands interactively
 124 when run, you must cause it, when started running for such
 125 interactive use in the most ordinary way, to print or display an
 126 announcement including an appropriate copyright notice and a
 127 notice that there is no warranty (or else, saying that you provide
 128 a warranty) and that users may redistribute the program under
 129 these conditions, and telling the user how to view a copy of this
 130 License.  (Exception: if the Program itself is interactive but
 131 does not normally print such an announcement, your work based on
 132 the Program is not required to print an announcement.)
 133           </ol>
 134
 135      <p>These requirements apply to the modified work as a whole.  If
 136 identifiable sections of that work are not derived from the Program,
 137 and can be reasonably considered independent and separate works in
 138 themselves, then this License, and its terms, do not apply to those
 139 sections when you distribute them as separate works.  But when you
 140 distribute the same sections as part of a whole which is a work based
 141 on the Program, the distribution of the whole must be on the terms of
 142 this License, whose permissions for other licensees extend to the
 143 entire whole, and thus to each and every part regardless of who wrote it.
 144
 145      <p>Thus, it is not the intent of this section to claim rights or contest
 146 your rights to work written entirely by you; rather, the intent is to
 147 exercise the right to control the distribution of derivative or
 148 collective works based on the Program.
 149
 150      <p>In addition, mere aggregation of another work not based on the Program
 151 with the Program (or with a work based on the Program) on a volume of
 152 a storage or distribution medium does not bring the other work under
 153 the scope of this License.
 154
 155      </p><li>You may copy and distribute the Program (or a work based on it,
 156 under Section 2) in object code or executable form under the terms of
 157 Sections 1 and 2 above provided that you also do one of the following:
 158
 159           <ol type=a start=1>
 160 <li>Accompany it with the complete corresponding machine-readable
 161 source code, which must be distributed under the terms of Sections
 162 1 and 2 above on a medium customarily used for software interchange; or,
 163
 164           <li>Accompany it with a written offer, valid for at least three
 165 years, to give any third party, for a charge no more than your
 166 cost of physically performing source distribution, a complete
 167 machine-readable copy of the corresponding source code, to be
 168 distributed under the terms of Sections 1 and 2 above on a medium
 169 customarily used for software interchange; or,
 170
 171           <li>Accompany it with the information you received as to the offer
 172 to distribute corresponding source code.  (This alternative is
 173 allowed only for noncommercial distribution and only if you
 174 received the program in object code or executable form with such
 175 an offer, in accord with Subsection b above.)
 176           </ol>
 177
 178      <p>The source code for a work means the preferred form of the work for
 179 making modifications to it.  For an executable work, complete source
 180 code means all the source code for all modules it contains, plus any
 181 associated interface definition files, plus the scripts used to
 182 control compilation and installation of the executable.  However, as a
 183 special exception, the source code distributed need not include
 184 anything that is normally distributed (in either source or binary
 185 form) with the major components (compiler, kernel, and so on) of the
 186 operating system on which the executable runs, unless that component
 187 itself accompanies the executable.
 188
 189      <p>If distribution of executable or object code is made by offering
 190 access to copy from a designated place, then offering equivalent
 191 access to copy the source code from the same place counts as
 192 distribution of the source code, even though third parties are not
 193 compelled to copy the source along with the object code.
 194
 195      </p><li>You may not copy, modify, sublicense, or distribute the Program
 196 except as expressly provided under this License.  Any attempt
 197 otherwise to copy, modify, sublicense or distribute the Program is
 198 void, and will automatically terminate your rights under this License.
 199 However, parties who have received copies, or rights, from you under
 200 this License will not have their licenses terminated so long as such
 201 parties remain in full compliance.
 202
 203      <li>You are not required to accept this License, since you have not
 204 signed it.  However, nothing else grants you permission to modify or
 205 distribute the Program or its derivative works.  These actions are
 206 prohibited by law if you do not accept this License.  Therefore, by
 207 modifying or distributing the Program (or any work based on the
 208 Program), you indicate your acceptance of this License to do so, and
 209 all its terms and conditions for copying, distributing or modifying
 210 the Program or works based on it.
 211
 212      <li>Each time you redistribute the Program (or any work based on the
 213 Program), the recipient automatically receives a license from the
 214 original licensor to copy, distribute or modify the Program subject to
 215 these terms and conditions.  You may not impose any further
 216 restrictions on the recipients' exercise of the rights granted herein.
 217 You are not responsible for enforcing compliance by third parties to
 218 this License.
 219
 220      <li>If, as a consequence of a court judgment or allegation of patent
 221 infringement or for any other reason (not limited to patent issues),
 222 conditions are imposed on you (whether by court order, agreement or
 223 otherwise) that contradict the conditions of this License, they do not
 224 excuse you from the conditions of this License.  If you cannot
 225 distribute so as to satisfy simultaneously your obligations under this
 226 License and any other pertinent obligations, then as a consequence you
 227 may not distribute the Program at all.  For example, if a patent
 228 license would not permit royalty-free redistribution of the Program by
 229 all those who receive copies directly or indirectly through you, then
 230 the only way you could satisfy both it and this License would be to
 231 refrain entirely from distribution of the Program.
 232
 233      <p>If any portion of this section is held invalid or unenforceable under
 234 any particular circumstance, the balance of the section is intended to
 235 apply and the section as a whole is intended to apply in other
 236 circumstances.
 237
 238      <p>It is not the purpose of this section to induce you to infringe any
 239 patents or other property right claims or to contest validity of any
 240 such claims; this section has the sole purpose of protecting the
 241 integrity of the free software distribution system, which is
 242 implemented by public license practices.  Many people have made
 243 generous contributions to the wide range of software distributed
 244 through that system in reliance on consistent application of that
 245 system; it is up to the author/donor to decide if he or she is willing
 246 to distribute software through any other system and a licensee cannot
 247 impose that choice.
 248
 249      <p>This section is intended to make thoroughly clear what is believed to
 250 be a consequence of the rest of this License.
 251
 252      </p><li>If the distribution and/or use of the Program is restricted in
 253 certain countries either by patents or by copyrighted interfaces, the
 254 original copyright holder who places the Program under this License
 255 may add an explicit geographical distribution limitation excluding
 256 those countries, so that distribution is permitted only in or among
 257 countries not thus excluded.  In such case, this License incorporates
 258 the limitation as if written in the body of this License.
 259
 260      <li>The Free Software Foundation may publish revised and/or new versions
 261 of the General Public License from time to time.  Such new versions will
 262 be similar in spirit to the present version, but may differ in detail to
 263 address new problems or concerns.
 264
 265      <p>Each version is given a distinguishing version number.  If the Program
 266 specifies a version number of this License which applies to it and "any
 267 later version", you have the option of following the terms and conditions
 268 either of that version or of any later version published by the Free
 269 Software Foundation.  If the Program does not specify a version number of
 270 this License, you may choose any version ever published by the Free Software
 271 Foundation.
 272
 273      </p><li>If you wish to incorporate parts of the Program into other free
 274 programs whose distribution conditions are different, write to the author
 275 to ask for permission.  For software which is copyrighted by the Free
 276 Software Foundation, write to the Free Software Foundation; we sometimes
 277 make exceptions for this.  Our decision will be guided by the two goals
 278 of preserving the free status of all derivatives of our free software and
 279 of promoting the sharing and reuse of software generally.
 280
 281      <div align="center">NO WARRANTY</div>
 282
 283 <li>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 284 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 285 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 286 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 287 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 288 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 289 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 290 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 291 REPAIR OR CORRECTION.
 292
 293      <li>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 294 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 295 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 296 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 297 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 298 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 299 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 300 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 301 POSSIBILITY OF SUCH DAMAGES.
 302         </ol>
 303
 304 <div align="center">END OF TERMS AND CONDITIONS</div>
 305
 306 <h3 class="unnumberedsec">How to Apply These Terms to Your New Programs</h3>
 307
 308    <p>If you develop a new program, and you want it to be of the greatest
 309 possible use to the public, the best way to achieve this is to make it
 310 free software which everyone can redistribute and change under these terms.
 311
 312    <p>To do so, attach the following notices to the program.  It is safest
 313 to attach them to the start of each source file to most effectively
 314 convey the exclusion of warranty; and each file should have at least
 315 the "copyright" line and a pointer to where the full notice is found.
 316
 317 <pre class="smallexample">     <var>one line to give the program's name and a brief idea of what it does.</var>
 318      Copyright (C) <var>year</var>  <var>name of author</var>
 319
 320      This program is free software; you can redistribute it and/or modify
 321      it under the terms of the GNU General Public License as published by
 322      the Free Software Foundation; either version 2 of the License, or
 323      (at your option) any later version.
 324
 325      This program is distributed in the hope that it will be useful,
 326      but WITHOUT ANY WARRANTY; without even the implied warranty of
 327      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 328      GNU General Public License for more details.
 329
 330      You should have received a copy of the GNU General Public License
 331      along with this program; if not, write to the Free Software
 332      Foundation, Inc., 59 Temple Place - Suite 330,
 333      Boston, MA 02111-1307, USA.
 334      </pre>
 335
 336    <p>Also add information on how to contact you by electronic and paper mail.
 337
 338    <p>If the program is interactive, make it output a short notice like this
 339 when it starts in an interactive mode:
 340
 341 <pre class="smallexample">     Gnomovision version 69, Copyright (C) <var>year</var> <var>name of author</var>
 342      Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
 343      type `show w'.
 344      This is free software, and you are welcome to redistribute it
 345      under certain conditions; type `show c' for details.
 346      </pre>
 347
 348    <p>The hypothetical commands <code>show w</code> and <code>show c</code> should show
 349 the appropriate parts of the General Public License.  Of course, the
 350 commands you use may be called something other than <code>show w</code> and
 351 <code>show c</code>; they could even be mouse-clicks or menu items--whatever
 352 suits your program.
 353
 354    <p>You should also get your employer (if you work as a programmer) or your
 355 school, if any, to sign a "copyright disclaimer" for the program, if
 356 necessary.  Here is a sample; alter the names:
 357
 358 <pre class="smallexample">     Yoyodyne, Inc., hereby disclaims all copyright interest in the program
 359      `Gnomovision' (which makes passes at compilers) written by James Hacker.
 360
 361      <var>signature of Ty Coon</var>, 1 April 1989
 362      Ty Coon, President of Vice
 363      </pre>
 364
 365    <p>This General Public License does not permit incorporating your program into
 366 proprietary programs.  If your program is a subroutine library, you may
 367 consider it more useful to permit linking proprietary applications with the
 368 library.  If this is what you want to do, use the GNU Library General
 369 Public License instead of this License.
 370
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 372