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   1  GNU GENERAL PUBLIC LICENSE
   2  
   3                              Version 2, June 1991
   4  
   5  Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass Ave,
   6  Cambridge, MA 02139, USA. Everyone is permitted to copy and distribute
   7  verbatim copies 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 freedom to
  12  share and change it. By contrast, the GNU General Public License is
  13  intended to guarantee your freedom to share and change free software--to
  14  make sure the software is free for all its users. This General Public License
  15  applies to most of the Free Software Foundation's software and to any other
  16  program whose authors commit to using it. (Some other Free Software
  17  Foundation software is covered by the GNU Library General Public License
  18  instead.) You can apply it to your programs, too.
  19  
  20  When we speak of free software, we are referring to freedom, not price. Our
  21  General Public Licenses are designed to make sure that you have the
  22  freedom to distribute copies of free software (and charge for this service if
  23  you wish), that you receive source code or can get it if you want it, that you
  24  can change the software or use pieces of it in new free programs; and that
  25  you know you can do these things.
  26  
  27  To protect your rights, we need to make restrictions that forbid anyone to
  28  deny you these rights or to ask you to surrender the rights. These restrictions
  29  translate to certain responsibilities for you if you distribute copies of the
  30  software, or if you modify it.
  31  
  32  For example, if you distribute copies of such a program, whether gratis or for
  33  a fee, you must give the recipients all the rights that you have. You must make
  34  sure that they, too, receive or can get the source code. And you must show
  35  them these terms so they know their rights.
  36  
  37  We protect your rights with two steps: (1) copyright the software, and (2)
  38  offer you this license which gives you legal permission to copy, distribute
  39  and/or modify the software.
  40  
  41  Also, for each author's protection and ours, we want to make certain that
  42  everyone understands that there is no warranty for this free software. If the
  43  software is modified by someone else and passed on, we want its recipients
  44  to know that what they have is not the original, so that any problems
  45  introduced by others will not reflect on the original authors' reputations.
  46  
  47  Finally, any free program is threatened constantly by software patents. We
  48  wish to avoid the danger that redistributors of a free program will individually
  49  obtain patent licenses, in effect making the program proprietary. To prevent
  50  this, we have made it clear that any patent must be licensed for everyone's
  51  free use or not licensed at all.
  52  
  53  The precise terms and conditions for copying, distribution and modification
  54  follow.
  55  
  56                     GNU GENERAL PUBLIC LICENSE
  57   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND
  58                               MODIFICATION
  59  
  60  0. This License applies to any program or other work which contains a notice
  61  placed by the copyright holder saying it may be distributed under the terms
  62  of this General Public License. The "Program", below, refers to any such
  63  program or work, and a "work based on the Program" means either the
  64  Program or any derivative work under copyright law: that is to say, a work
  65  containing the Program or a portion of it, either verbatim or with
  66  modifications and/or translated into another language. (Hereinafter, translation
  67  is included without limitation in the term "modification".) Each licensee is
  68  addressed as "you".
  69  
  70  Activities other than copying, distribution and modification are not covered
  71  by this License; they are outside its scope. The act of running the Program is
  72  not restricted, and the output from the Program is covered only if its contents
  73  constitute a work based on the Program (independent of having been made
  74  by running the Program). Whether that is true depends on what the Program
  75  does.
  76  
  77  1. You may copy and distribute verbatim copies of the Program's source
  78  code as you receive it, in any medium, provided that you conspicuously and
  79  appropriately publish on each copy an appropriate copyright notice and
  80  disclaimer of warranty; keep intact all the notices that refer to this License
  81  and to the absence of any warranty; and give any other recipients of the
  82  Program a copy of this License along with the Program.
  83  
  84  You may charge a fee for the physical act of transferring a copy, and you
  85  may at your option offer warranty protection in exchange for a fee.
  86  
  87  2. You may modify your copy or copies of the Program or any portion of it,
  88  thus forming a work based on the Program, and copy and distribute such
  89  modifications or work under the terms of Section 1 above, provided that you
  90  also meet all of these conditions:
  91  
  92  a) You must cause the modified files to carry prominent notices stating that
  93  you changed the files and the date of any change.
  94  
  95  b) You must cause any work that you distribute or publish, that in whole or in
  96  part contains or is derived from the Program or any part thereof, to be
  97  licensed as a whole at no charge to all third parties under the terms of this
  98  License.
  99  
 100  c) If the modified program normally reads commands interactively when run,
 101  you must cause it, when started running for such interactive use in the most
 102  ordinary way, to print or display an announcement including an appropriate
 103  copyright notice and a notice that there is no warranty (or else, saying that
 104  you provide a warranty) and that users may redistribute the program under
 105  these conditions, and telling the user how to view a copy of this License.
 106  (Exception: if the Program itself is interactive but does not normally print such
 107  an announcement, your work based on the Program is not required to print
 108  an announcement.)
 109  
 110  These requirements apply to the modified work as a whole. If identifiable
 111  sections of that work are not derived from the Program, and can be
 112  reasonably considered independent and separate works in themselves, then
 113  this License, and its terms, do not apply to those sections when you distribute
 114  them as separate works. But when you distribute the same sections as part
 115  of a whole which is a work based on the Program, the distribution of the
 116  whole must be on the terms of this License, whose permissions for other
 117  licensees extend to the entire whole, and thus to each and every part
 118  regardless of who wrote it.
 119  
 120  Thus, it is not the intent of this section to claim rights or contest your rights to
 121  work written entirely by you; rather, the intent is to exercise the right to
 122  control the distribution of derivative or collective works based on the
 123  Program.
 124  
 125  In addition, mere aggregation of another work not based on the Program
 126  with the Program (or with a work based on the Program) on a volume of a
 127  storage or distribution medium does not bring the other work under the scope
 128  of this License.
 129  
 130  3. You may copy and distribute the Program (or a work based on it, under
 131  Section 2) in object code or executable form under the terms of Sections 1
 132  and 2 above provided that you also do one of the following:
 133  
 134  a) Accompany it with the complete corresponding machine-readable source
 135  code, which must be distributed under the terms of Sections 1 and 2 above
 136  on a medium customarily used for software interchange; or,
 137  
 138  b) Accompany it with a written offer, valid for at least three years, to give
 139  any third party, for a charge no more than your cost of physically performing
 140  source distribution, a complete machine-readable copy of the corresponding
 141  source code, to be distributed under the terms of Sections 1 and 2 above on
 142  a medium customarily used for software interchange; or,
 143  
 144  c) Accompany it with the information you received as to the offer to distribute
 145  corresponding source code. (This alternative is allowed only for
 146  noncommercial distribution and only if you received the program in object
 147  code or executable form with such an offer, in accord with Subsection b
 148  above.)
 149  
 150  The source code for a work means the preferred form of the work for
 151  making modifications to it. For an executable work, complete source code
 152  means all the source code for all modules it contains, plus any associated
 153  interface definition files, plus the scripts used to control compilation and
 154  installation of the executable. However, as a special exception, the source
 155  code distributed need not include anything that is normally distributed (in
 156  either source or binary form) with the major components (compiler, kernel,
 157  and so on) of the operating system on which the executable runs, unless that
 158  component itself accompanies the executable.
 159  
 160  If distribution of executable or object code is made by offering access to
 161  copy from a designated place, then offering equivalent access to copy the
 162  source code from the same place counts as distribution of the source code,
 163  even though third parties are not compelled to copy the source along with the
 164  object code.
 165  
 166  4. You may not copy, modify, sublicense, or distribute the Program except as
 167  expressly provided under this License. Any attempt otherwise to copy,
 168  modify, sublicense or distribute the Program is void, and will automatically
 169  terminate your rights under this License. However, parties who have received
 170  copies, or rights, from you under this License will not have their licenses
 171  terminated so long as such parties remain in full compliance.
 172  
 173  5. You are not required to accept this License, since you have not signed it.
 174  However, nothing else grants you permission to modify or distribute the
 175  Program or its derivative works. These actions are prohibited by law if you
 176  do not accept this License. Therefore, by modifying or distributing the
 177  Program (or any work based on the Program), you indicate your acceptance
 178  of this License to do so, and all its terms and conditions for copying,
 179  distributing or modifying the Program or works based on it.
 180  
 181  6. Each time you redistribute the Program (or any work based on the
 182  Program), the recipient automatically receives a license from the original
 183  licensor to copy, distribute or modify the Program subject to these terms and
 184  conditions. You may not impose any further restrictions on the recipients'
 185  exercise of the rights granted herein. You are not responsible for enforcing
 186  compliance by third parties to this License.
 187  
 188  7. If, as a consequence of a court judgment or allegation of patent
 189  infringement or for any other reason (not limited to patent issues), conditions
 190  are imposed on you (whether by court order, agreement or otherwise) that
 191  contradict the conditions of this License, they do not excuse you from the
 192  conditions of this License. If you cannot distribute so as to satisfy
 193  simultaneously your obligations under this License and any other pertinent
 194  obligations, then as a consequence you may not distribute the Program at all.
 195  For example, if a patent license would not permit royalty-free redistribution
 196  of the Program by all those who receive copies directly or indirectly through
 197  you, then the only way you could satisfy both it and this License would be to
 198  refrain entirely from distribution of the Program.
 199  
 200  If any portion of this section is held invalid or unenforceable under any
 201  particular circumstance, the balance of the section is intended to apply and
 202  the section as a whole is intended to apply in other circumstances.
 203  
 204  It is not the purpose of this section to induce you to infringe any patents or
 205  other property right claims or to contest validity of any such claims; this
 206  section has the sole purpose of protecting the integrity of the free software
 207  distribution system, which is implemented by public license practices. Many
 208  people have made generous contributions to the wide range of software
 209  distributed through that system in reliance on consistent application of that
 210  system; it is up to the author/donor to decide if he or she is willing to
 211  distribute software through any other system and a licensee cannot impose
 212  that choice.
 213  
 214  This section is intended to make thoroughly clear what is believed to be a
 215  consequence of the rest of this License.
 216  
 217  8. If the distribution and/or use of the Program is restricted in certain
 218  countries either by patents or by copyrighted interfaces, the original copyright
 219  holder who places the Program under this License may add an explicit
 220  geographical distribution limitation excluding those countries, so that
 221  distribution is permitted only in or among countries not thus excluded. In such
 222  case, this License incorporates the limitation as if written in the body of this
 223  License.
 224  
 225  9. The Free Software Foundation may publish revised and/or new versions
 226  of the General Public License from time to time. Such new versions will be
 227  similar in spirit to the present version, but may differ in detail to address new
 228  problems or concerns.
 229  
 230  Each version is given a distinguishing version number. If the Program specifies
 231  a version number of this License which applies to it and "any later version",
 232  you have the option of following the terms and conditions either of that
 233  version or of any later version published by the Free Software Foundation. If
 234  the Program does not specify a version number of this License, you may
 235  choose any version ever published by the Free Software Foundation.
 236  
 237  10. If you wish to incorporate parts of the Program into other free programs
 238  whose distribution conditions are different, write to the author to ask for
 239  permission. For software which is copyrighted by the Free Software
 240  Foundation, write to the Free Software Foundation; we sometimes make
 241  exceptions for this. Our decision will be guided by the two goals of
 242  preserving the free status of all derivatives of our free software and of
 243  promoting the sharing and reuse of software generally.
 244  
 245                               NO WARRANTY
 246  
 247  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE,
 248  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT
 249  PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
 250  STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
 251  OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
 252  WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
 253  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 254  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 255  PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
 256  PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
 257  PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
 258  NECESSARY SERVICING, REPAIR OR CORRECTION.
 259  
 260  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR
 261  AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR
 262  ANY OTHER PARTY WHO MAY MODIFY AND/OR
 263  REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
 264  LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
 265  SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
 266  ARISING OUT OF THE USE OR INABILITY TO USE THE
 267  PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA
 268  OR DATA BEING RENDERED INACCURATE OR LOSSES
 269  SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
 270  PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN
 271  IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF
 272  THE POSSIBILITY OF SUCH DAMAGES.
 273  
 274                    END OF TERMS AND CONDITIONS