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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  

  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