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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                         59 Temple Place, Suite 330, Boston, MA  02111-1307  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 Library 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                      GNU GENERAL PUBLIC LICENSE
  59     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  60  
  61    0. This License applies to any program or other work which contains
  62  a notice placed by the copyright holder saying it may be distributed
  63  under the terms of this General Public License.  The "Program", below,
  64  refers to any such program or work, and a "work based on the Program"
  65  means either the Program or any derivative work under copyright law:
  66  that is to say, a work containing the Program or a portion of it,
  67  either verbatim or with modifications and/or translated into another
  68  language.  (Hereinafter, translation is included without limitation in
  69  the term "modification".)  Each licensee is addressed as "you".
  70  
  71  Activities other than copying, distribution and modification are not
  72  covered by this License; they are outside its scope.  The act of
  73  running the Program is not restricted, and the output from the Program
  74  is covered only if its contents constitute a work based on the
  75  Program (independent of having been made by running the Program).
  76  Whether that is true depends on what the Program does.
  77  
  78    1. You may copy and distribute verbatim copies of the Program's
  79  source code as you receive it, in any medium, provided that you
  80  conspicuously and appropriately publish on each copy an appropriate
  81  copyright notice and disclaimer of warranty; keep intact all the
  82  notices that refer to this License and to the absence of any warranty;
  83  and give any other recipients of the Program a copy of this License
  84  along with the Program.
  85  
  86  You may charge a fee for the physical act of transferring a copy, and
  87  you may at your option offer warranty protection in exchange for a fee.
  88  
  89    2. You may modify your copy or copies of the Program or any portion
  90  of it, thus forming a work based on the Program, and copy and
  91  distribute such modifications or work under the terms of Section 1
  92  above, provided that you also meet all of these conditions:
  93  
  94      a) You must cause the modified files to carry prominent notices
  95      stating that you changed the files and the date of any change.
  96  
  97      b) You must cause any work that you distribute or publish, that in
  98      whole or in part contains or is derived from the Program or any
  99      part thereof, to be licensed as a whole at no charge to all third
 100      parties under the terms of this License.
 101  
 102      c) If the modified program normally reads commands interactively
 103      when run, you must cause it, when started running for such
 104      interactive use in the most ordinary way, to print or display an
 105      announcement including an appropriate copyright notice and a
 106      notice that there is no warranty (or else, saying that you provide
 107      a warranty) and that users may redistribute the program under
 108      these conditions, and telling the user how to view a copy of this
 109      License.  (Exception: if the Program itself is interactive but
 110      does not normally print such an announcement, your work based on
 111      the Program is not required to print an announcement.)
 112  These requirements apply to the modified work as a whole.  If
 113  identifiable sections of that work are not derived from the Program,
 114  and can be reasonably considered independent and separate works in
 115  themselves, then this License, and its terms, do not apply to those
 116  sections when you distribute them as separate works.  But when you
 117  distribute the same sections as part of a whole which is a work based
 118  on the Program, the distribution of the whole must be on the terms of
 119  this License, whose permissions for other licensees extend to the
 120  entire whole, and thus to each and every part regardless of who wrote it.
 121  
 122  Thus, it is not the intent of this section to claim rights or contest
 123  your rights to work written entirely by you; rather, the intent is to
 124  exercise the right to control the distribution of derivative or
 125  collective works based on the Program.
 126  
 127  In addition, mere aggregation of another work not based on the Program
 128  with the Program (or with a work based on the Program) on a volume of
 129  a storage or distribution medium does not bring the other work under
 130  the scope of this License.
 131  
 132    3. You may copy and distribute the Program (or a work based on it,
 133  under Section 2) in object code or executable form under the terms of
 134  Sections 1 and 2 above provided that you also do one of the following:
 135  
 136      a) Accompany it with the complete corresponding machine-readable
 137      source code, which must be distributed under the terms of Sections
 138      1 and 2 above on a medium customarily used for software interchange; or,
 139  
 140      b) Accompany it with a written offer, valid for at least three
 141      years, to give any third party, for a charge no more than your
 142      cost of physically performing source distribution, a complete
 143      machine-readable copy of the corresponding source code, to be
 144      distributed under the terms of Sections 1 and 2 above on a medium
 145      customarily used for software interchange; or,
 146  
 147      c) Accompany it with the information you received as to the offer
 148      to distribute corresponding source code.  (This alternative is
 149      allowed only for noncommercial distribution and only if you
 150      received the program in object code or executable form with such
 151      an offer, in accord with Subsection b above.)
 152  
 153  The source code for a work means the preferred form of the work for
 154  making modifications to it.  For an executable work, complete source
 155  code means all the source code for all modules it contains, plus any
 156  associated interface definition files, plus the scripts used to
 157  control compilation and installation of the executable.  However, as a
 158  special exception, the source code distributed need not include
 159  anything that is normally distributed (in either source or binary
 160  form) with the major components (compiler, kernel, and so on) of the
 161  operating system on which the executable runs, unless that component
 162  itself accompanies the executable.
 163  
 164  If distribution of executable or object code is made by offering
 165  access to copy from a designated place, then offering equivalent
 166  access to copy the source code from the same place counts as
 167  distribution of the source code, even though third parties are not
 168  compelled to copy the source along with the object code.
 169    4. You may not copy, modify, sublicense, or distribute the Program
 170  except as expressly provided under this License.  Any attempt
 171  otherwise to copy, modify, sublicense or distribute the Program is
 172  void, and will automatically terminate your rights under this License.
 173  However, parties who have received copies, or rights, from you under
 174  this License will not have their licenses terminated so long as such
 175  parties remain in full compliance.
 176  
 177    5. You are not required to accept this License, since you have not
 178  signed it.  However, nothing else grants you permission to modify or
 179  distribute the Program or its derivative works.  These actions are
 180  prohibited by law if you do not accept this License.  Therefore, by
 181  modifying or distributing the Program (or any work based on the
 182  Program), you indicate your acceptance of this License to do so, and
 183  all its terms and conditions for copying, distributing or modifying
 184  the Program or works based on it.
 185  
 186    6. Each time you redistribute the Program (or any work based on the
 187  Program), the recipient automatically receives a license from the
 188  original licensor to copy, distribute or modify the Program subject to
 189  these terms and conditions.  You may not impose any further
 190  restrictions on the recipients' exercise of the rights granted herein.
 191  You are not responsible for enforcing compliance by third parties to
 192  this License.
 193  
 194    7. If, as a consequence of a court judgment or allegation of patent
 195  infringement or for any other reason (not limited to patent issues),
 196  conditions are imposed on you (whether by court order, agreement or
 197  otherwise) that contradict the conditions of this License, they do not
 198  excuse you from the conditions of this License.  If you cannot
 199  distribute so as to satisfy simultaneously your obligations under this
 200  License and any other pertinent obligations, then as a consequence you
 201  may not distribute the Program at all.  For example, if a patent
 202  license would not permit royalty-free redistribution of the Program by
 203  all those who receive copies directly or indirectly through you, then
 204  the only way you could satisfy both it and this License would be to
 205  refrain entirely from distribution of the Program.
 206  
 207  If any portion of this section is held invalid or unenforceable under
 208  any particular circumstance, the balance of the section is intended to
 209  apply and the section as a whole is intended to apply in other
 210  circumstances.
 211  
 212  It is not the purpose of this section to induce you to infringe any
 213  patents or other property right claims or to contest validity of any
 214  such claims; this section has the sole purpose of protecting the
 215  integrity of the free software distribution system, which is
 216  implemented by public license practices.  Many people have made
 217  generous contributions to the wide range of software distributed
 218  through that system in reliance on consistent application of that
 219  system; it is up to the author/donor to decide if he or she is willing
 220  to distribute software through any other system and a licensee cannot
 221  impose that choice.
 222  
 223  This section is intended to make thoroughly clear what is believed to
 224  be a consequence of the rest of this License.
 225  
 226    8. If the distribution and/or use of the Program is restricted in
 227  certain countries either by patents or by copyrighted interfaces, the
 228  original copyright holder who places the Program under this License
 229  may add an explicit geographical distribution limitation excluding
 230  those countries, so that distribution is permitted only in or among
 231  countries not thus excluded.  In such case, this License incorporates
 232  the limitation as if written in the body of this License.
 233  
 234    9. The Free Software Foundation may publish revised and/or new versions
 235  of the General Public License from time to time.  Such new versions will
 236  be similar in spirit to the present version, but may differ in detail to
 237  address new problems or concerns.
 238  
 239  Each version is given a distinguishing version number.  If the Program
 240  specifies a version number of this License which applies to it and "any
 241  later version", you have the option of following the terms and conditions
 242  either of that version or of any later version published by the Free
 243  Software Foundation.  If the Program does not specify a version number of
 244  this License, you may choose any version ever published by the Free Software
 245  Foundation.
 246  
 247    10. If you wish to incorporate parts of the Program into other free
 248  programs whose distribution conditions are different, write to the author
 249  to ask for permission.  For software which is copyrighted by the Free
 250  Software Foundation, write to the Free Software Foundation; we sometimes
 251  make exceptions for this.  Our decision will be guided by the two goals
 252  of preserving the free status of all derivatives of our free software and
 253  of promoting the sharing and reuse of software generally.
 254  
 255                              NO WARRANTY
 256  
 257    11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 258  FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 259  OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 260  PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 261  OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 262  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 263  TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 264  PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 265  REPAIR OR CORRECTION.
 266  
 267    12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 268  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 269  REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 270  INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 271  OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 272  TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 273  YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 274  PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 275  POSSIBILITY OF SUCH DAMAGES.
 276  
 277                       END OF TERMS AND CONDITIONS
 278