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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.