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   1  The GNU General Public License (GPL)
   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  
   7  Everyone is permitted to copy and distribute verbatim copies
   8  of this license document, but changing it is not allowed.
   9  
  10  Preamble
  11  
  12  The licenses for most software are designed to take away your freedom
  13  to share and change it. By contrast, the GNU General Public License
  14  is intended to guarantee your freedom to share and change free
  15  software--to make sure the software is free for all its users. This
  16  General Public License applies to most of the Free Software
  17  Foundation's software and to any other program whose authors commit
  18  to using it. (Some other Free Software Foundation software is covered
  19  by the GNU Library General Public License instead.) You can apply it
  20  to your programs, too.
  21  
  22  When we speak of free software, we are referring to freedom, not
  23  price. Our General Public Licenses are designed to make sure that you
  24  have the freedom to distribute copies of free software (and charge
  25  for this service if you wish), that you receive source code or can
  26  get it if you want it, that you can change the software or use pieces
  27  of it in new free programs; and that you know you can do these
  28  things.
  29  
  30  To protect your rights, we need to make restrictions that forbid
  31  anyone to deny you these rights or to ask you to surrender the
  32  rights. These restrictions translate to certain responsibilities for
  33  you if you distribute copies of the software, or if you modify it.
  34  
  35  For example, if you distribute copies of such a program, whether
  36  gratis or for a fee, you must give the recipients all the rights that
  37  you have. You must make sure that they, too, receive or can get the
  38  source code. And you must show them these terms so they know their
  39  rights.
  40  
  41  We protect your rights with two steps: (1) copyright the software,
  42  and (2) offer you this license which gives you legal permission to
  43  copy, distribute and/or modify the software.
  44  
  45  Also, for each author's protection and ours, we want to make certain
  46  that everyone understands that there is no warranty for this free
  47  software. If the software is modified by someone else and passed on,
  48  we want its recipients to know that what they have is not the
  49  original, so that any problems introduced by others will not reflect
  50  on the original authors' reputations.
  51  
  52  Finally, any free program is threatened constantly by software
  53  patents. We wish to avoid the danger that redistributors of a free
  54  program will individually obtain patent licenses, in effect making
  55  the program proprietary. To prevent this, we have made it clear that
  56  any patent must be licensed for everyone's free use or not licensed
  57  at all.
  58  
  59  The precise terms and conditions for copying, distribution and
  60  modification follow.
  61  
  62  TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  63  
  64  0. This License applies to any program or other work which contains a
  65  notice placed by the copyright holder saying it may be distributed
  66  under the terms of this General Public License. The "Program", below,
  67  refers to any such program or work, and a "work based on the Program"
  68  means either the Program or any derivative work under copyright law:
  69  that is to say, a work containing the Program or a portion of it,
  70  either verbatim or with modifications and/or translated into another
  71  language. (Hereinafter, translation is included without limitation in
  72  the term "modification".) Each licensee is addressed as "you".
  73  
  74  Activities other than copying, distribution and modification are not
  75  covered by this License; they are outside its scope. The act of
  76  running the Program is not restricted, and the output from the
  77  Program is covered only if its contents constitute a work based on
  78  the Program (independent of having been made by running the Program).
  79  Whether that is true depends on what the Program does.
  80  
  81  1. You may copy and distribute verbatim copies of the Program's
  82  source code as you receive it, in any medium, provided that you
  83  conspicuously and appropriately publish on each copy an appropriate
  84  copyright notice and disclaimer of warranty; keep intact all the
  85  notices that refer to this License and to the absence of any
  86  warranty; and give any other recipients of the Program a copy of this
  87  License along with the Program.
  88  
  89  You may charge a fee for the physical act of transferring a copy, and
  90  you may at your option offer warranty protection in exchange for a
  91  fee.
  92  
  93  2. You may modify your copy or copies of the Program or any portion
  94  of it, thus forming a work based on the Program, and copy and
  95  distribute such modifications or work under the terms of Section 1
  96  above, provided that you also meet all of these conditions:
  97  
  98      a) You must cause the modified files to carry prominent notices
  99         stating that you changed the files and the date of any change.
 100  
 101      b) You must cause any work that you distribute or publish, that
 102         in whole or in part contains or is derived from the Program or
 103         any part thereof, to be licensed as a whole at no charge to
 104         all third parties under the terms of this License.
 105  
 106      c) If the modified program normally reads commands interactively
 107         when run, you must cause it, when started running for such
 108         interactive use in the most ordinary way, to print or display
 109         an announcement including an appropriate copyright notice and
 110         a notice that there is no warranty (or else, saying that you
 111         provide a warranty) and that users may redistribute the
 112         program under these conditions, and telling the user how to
 113         view a copy of this License. (Exception: if the Program itself
 114         is interactive but does not normally print such an
 115         announcement, your work based on the Program is not required
 116         to print an announcement.)
 117  
 118  These requirements apply to the modified work as a whole. If
 119  identifiable sections of that work are not derived from the Program,
 120  and can be reasonably considered independent and separate works in
 121  themselves, then this License, and its terms, do not apply to those
 122  sections when you distribute them as separate works. But when you
 123  distribute the same sections as part of a whole which is a work based
 124  on the Program, the distribution of the whole must be on the terms of
 125  this License, whose permissions for other licensees extend to the
 126  entire whole, and thus to each and every part regardless of who wrote
 127  it.
 128  
 129  Thus, it is not the intent of this section to claim rights or contest
 130  your rights to work written entirely by you; rather, the intent is to
 131  exercise the right to control the distribution of derivative or
 132  collective works based on the Program.
 133  
 134  In addition, mere aggregation of another work not based on the
 135  Program with the Program (or with a work based on the Program) on a
 136  volume of a storage or distribution medium does not bring the other
 137  work under the scope of this License.
 138  
 139  3. You may copy and distribute the Program (or a work based on it,
 140  under Section 2) in object code or executable form under the terms of
 141  Sections 1 and 2 above provided that you also do one of the
 142  following:
 143  
 144      a) Accompany it with the complete corresponding machine-readable
 145         source code, which must be distributed under the terms of
 146         Sections 1 and 2 above on a medium customarily used for
 147         software interchange; or,
 148  
 149      b) Accompany it with a written offer, valid for at least three
 150         years, to give any third party, for a charge no more than your
 151         cost of physically performing source distribution, a complete
 152         machine-readable copy of the corresponding source code, to be
 153         distributed under the terms of Sections 1 and 2 above on a
 154         medium customarily used for software interchange; or,
 155  
 156      c) Accompany it with the information you received as to the offer
 157         to distribute corresponding source code. (This alternative is
 158         allowed only for noncommercial distribution and only if you
 159         received the program in object code or executable form with
 160         such an offer, in accord with Subsection b above.)
 161  
 162  The source code for a work means the preferred form of the work for
 163  making modifications to it. For an executable work, complete source
 164  code means all the source code for all modules it contains, plus any
 165  associated interface definition files, plus the scripts used to
 166  control compilation and installation of the executable. However, as a
 167  special exception, the source code distributed need not include
 168  anything that is normally distributed (in either source or binary
 169  form) with the major components (compiler, kernel, and so on) of the
 170  operating system on which the executable runs, unless that component
 171  itself accompanies the executable.
 172  
 173  If distribution of executable or object code is made by offering
 174  access to copy from a designated place, then offering equivalent
 175  access to copy the source code from the same place counts as
 176  distribution of the source code, even though third parties are not
 177  compelled to copy the source along with the object code.
 178  
 179  4. You may not copy, modify, sublicense, or distribute the Program
 180  except as expressly provided under this License. Any attempt
 181  otherwise to copy, modify, sublicense or distribute the Program is
 182  void, and will automatically terminate your rights under this
 183  License. However, parties who have received copies, or rights, from
 184  you under this License will not have their licenses terminated so
 185  long as such parties remain in full compliance.
 186  
 187  5. You are not required to accept this License, since you have not
 188  signed it. However, nothing else grants you permission to modify or
 189  distribute the Program or its derivative works. These actions are
 190  prohibited by law if you do not accept this License. Therefore, by
 191  modifying or distributing the Program (or any work based on the
 192  Program), you indicate your acceptance of this License to do so, and
 193  all its terms and conditions for copying, distributing or modifying
 194  the Program or works based on it.
 195  
 196  6. Each time you redistribute the Program (or any work based on the
 197  Program), the recipient automatically receives a license from the
 198  original licensor to copy, distribute or modify the Program subject
 199  to these terms and conditions. You may not impose any further
 200  restrictions on the recipients' exercise of the rights granted
 201  herein. You are not responsible for enforcing compliance by third
 202  parties to this License.
 203  
 204  7. If, as a consequence of a court judgment or allegation of patent
 205  infringement or for any other reason (not limited to patent issues),
 206  conditions are imposed on you (whether by court order, agreement or
 207  otherwise) that contradict the conditions of this License, they do
 208  not excuse you from the conditions of this License. If you cannot
 209  distribute so as to satisfy simultaneously your obligations under
 210  this License and any other pertinent obligations, then as a
 211  consequence you may not distribute the Program at all. For example,
 212  if a patent license would not permit royalty-free redistribution of
 213  the Program by all those who receive copies directly or indirectly
 214  through you, then the only way you could satisfy both it and this
 215  License would be to refrain entirely from distribution of the
 216  Program.
 217  
 218  If any portion of this section is held invalid or unenforceable under
 219  any particular circumstance, the balance of the section is intended
 220  to apply and the section as a whole is intended to apply in other
 221  circumstances.
 222  
 223  It is not the purpose of this section to induce you to infringe any
 224  patents or other property right claims or to contest validity of any
 225  such claims; this section has the sole purpose of protecting the
 226  integrity of the free software distribution system, which is
 227  implemented by public license practices. Many people have made
 228  generous contributions to the wide range of software distributed
 229  through that system in reliance on consistent application of that
 230  system; it is up to the author/donor to decide if he or she is
 231  willing to distribute software through any other system and a
 232  licensee cannot impose that choice.
 233  
 234  This section is intended to make thoroughly clear what is believed to
 235  be a consequence of the rest of this License.
 236  
 237  8. If the distribution and/or use of the Program is restricted in
 238  certain countries either by patents or by copyrighted interfaces, the
 239  original copyright holder who places the Program under this License
 240  may add an explicit geographical distribution limitation excluding
 241  those countries, so that distribution is permitted only in or among
 242  countries not thus excluded. In such case, this License incorporates
 243  the limitation as if written in the body of this License.
 244  
 245  9. The Free Software Foundation may publish revised and/or new
 246  versions of the General Public License from time to time. Such new
 247  versions will be similar in spirit to the present version, but may
 248  differ in detail to address new problems or concerns.
 249  
 250  Each version is given a distinguishing version number. If the Program
 251  specifies a version number of this License which applies to it and
 252  "any later version", you have the option of following the terms and
 253  conditions either of that version or of any later version published
 254  by the Free Software Foundation. If the Program does not specify a
 255  version number of this License, you may choose any version ever
 256  published by the Free Software Foundation.
 257  
 258  10. If you wish to incorporate parts of the Program into other free
 259  programs whose distribution conditions are different, write to the
 260  author to ask for permission. For software which is copyrighted by
 261  the Free Software Foundation, write to the Free Software Foundation;
 262  we sometimes make exceptions for this. Our decision will be guided by
 263  the two goals of preserving the free status of all derivatives of our
 264  free software and of promoting the sharing and reuse of software
 265  generally.
 266  
 267  NO WARRANTY
 268  
 269  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
 270  WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
 271  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
 272  OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY
 273  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
 274  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 275  PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
 276  PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 277  THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 278  
 279  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
 280  WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
 281  AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU
 282  FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
 283  CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
 284  PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
 285  RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
 286  FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF
 287  SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
 288  SUCH DAMAGES.
 289  
 290  END OF TERMS AND CONDITIONS