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     1 Copyright and License of TWiki
       
     2 ------------------------------
       
     3 
       
     4 TWiki (TM) is copyright as described in the file COPYRIGHT
       
     5 accompanying this notice.
       
     6 
       
     7 TWiki is open source software; you can redistribute it 
       
     8 and/or modify it under the terms of the GNU General Public 
       
     9 License as published by the Free Software Foundation; 
       
    10 either version 2 of the License, or (at your option) any 
       
    11 later version. We would appreciate it if redistributions of 
       
    12 TWiki and its clones retain this file in its entire form,
       
    13 thus acknowledging the origin of TWiki and the thousands
       
    14 of hours the contributors put into creating this software.
       
    15 
       
    16 This program is distributed in the hope that it will be 
       
    17 useful, but WITHOUT ANY WARRANTY; without even the implied 
       
    18 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
       
    19 PURPOSE. See the GNU General Public License for more 
       
    20 details, for your convenience attached below, also 
       
    21 published at http://www.gnu.org/copyleft/gpl.html
       
    22 
       
    23 --
       
    24 Peter Thoeny, Peter@Thoeny.org, http://TWiki.org/
       
    25 
       
    26 
       
    27 -----( http://www.gnu.org/copyleft/gpl.html )------------------------------
       
    28 
       
    29                     GNU GENERAL PUBLIC LICENSE
       
    30                        Version 2, June 1991
       
    31 
       
    32  Copyright (C) 1989, 1991 Free Software Foundation, Inc.
       
    33                        59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
       
    34  Everyone is permitted to copy and distribute verbatim copies
       
    35  of this license document, but changing it is not allowed.
       
    36 
       
    37                             Preamble
       
    38 
       
    39   The licenses for most software are designed to take away your
       
    40 freedom to share and change it.  By contrast, the GNU General Public
       
    41 License is intended to guarantee your freedom to share and change free
       
    42 software--to make sure the software is free for all its users.  This
       
    43 General Public License applies to most of the Free Software
       
    44 Foundation's software and to any other program whose authors commit to
       
    45 using it.  (Some other Free Software Foundation software is covered by
       
    46 the GNU Library General Public License instead.)  You can apply it to
       
    47 your programs, too.
       
    48 
       
    49   When we speak of free software, we are referring to freedom, not
       
    50 price.  Our General Public Licenses are designed to make sure that you
       
    51 have the freedom to distribute copies of free software (and charge for
       
    52 this service if you wish), that you receive source code or can get it
       
    53 if you want it, that you can change the software or use pieces of it
       
    54 in new free programs; and that you know you can do these things.
       
    55 
       
    56   To protect your rights, we need to make restrictions that forbid
       
    57 anyone to deny you these rights or to ask you to surrender the rights.
       
    58 These restrictions translate to certain responsibilities for you if you
       
    59 distribute copies of the software, or if you modify it.
       
    60 
       
    61   For example, if you distribute copies of such a program, whether
       
    62 gratis or for a fee, you must give the recipients all the rights that
       
    63 you have.  You must make sure that they, too, receive or can get the
       
    64 source code.  And you must show them these terms so they know their
       
    65 rights.
       
    66 
       
    67   We protect your rights with two steps: (1) copyright the software, and
       
    68 (2) offer you this license which gives you legal permission to copy,
       
    69 distribute and/or modify the software.
       
    70 
       
    71   Also, for each author's protection and ours, we want to make certain
       
    72 that everyone understands that there is no warranty for this free
       
    73 software.  If the software is modified by someone else and passed on, we
       
    74 want its recipients to know that what they have is not the original, so
       
    75 that any problems introduced by others will not reflect on the original
       
    76 authors' reputations.
       
    77 
       
    78   Finally, any free program is threatened constantly by software
       
    79 patents.  We wish to avoid the danger that redistributors of a free
       
    80 program will individually obtain patent licenses, in effect making the
       
    81 program proprietary.  To prevent this, we have made it clear that any
       
    82 patent must be licensed for everyone's free use or not licensed at all.
       
    83 
       
    84   The precise terms and conditions for copying, distribution and
       
    85 modification follow.
       
    86 
       
    87                     GNU GENERAL PUBLIC LICENSE
       
    88    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
       
    89 
       
    90   0. This License applies to any program or other work which contains
       
    91 a notice placed by the copyright holder saying it may be distributed
       
    92 under the terms of this General Public License.  The "Program", below,
       
    93 refers to any such program or work, and a "work based on the Program"
       
    94 means either the Program or any derivative work under copyright law:
       
    95 that is to say, a work containing the Program or a portion of it,
       
    96 either verbatim or with modifications and/or translated into another
       
    97 language.  (Hereinafter, translation is included without limitation in
       
    98 the term "modification".)  Each licensee is addressed as "you".
       
    99 
       
   100 Activities other than copying, distribution and modification are not
       
   101 covered by this License; they are outside its scope.  The act of
       
   102 running the Program is not restricted, and the output from the Program
       
   103 is covered only if its contents constitute a work based on the
       
   104 Program (independent of having been made by running the Program).
       
   105 Whether that is true depends on what the Program does.
       
   106 
       
   107   1. You may copy and distribute verbatim copies of the Program's
       
   108 source code as you receive it, in any medium, provided that you
       
   109 conspicuously and appropriately publish on each copy an appropriate
       
   110 copyright notice and disclaimer of warranty; keep intact all the
       
   111 notices that refer to this License and to the absence of any warranty;
       
   112 and give any other recipients of the Program a copy of this License
       
   113 along with the Program.
       
   114 
       
   115 You may charge a fee for the physical act of transferring a copy, and
       
   116 you may at your option offer warranty protection in exchange for a fee.
       
   117 
       
   118   2. You may modify your copy or copies of the Program or any portion
       
   119 of it, thus forming a work based on the Program, and copy and
       
   120 distribute such modifications or work under the terms of Section 1
       
   121 above, provided that you also meet all of these conditions:
       
   122 
       
   123     a) You must cause the modified files to carry prominent notices
       
   124     stating that you changed the files and the date of any change.
       
   125 
       
   126     b) You must cause any work that you distribute or publish, that in
       
   127     whole or in part contains or is derived from the Program or any
       
   128     part thereof, to be licensed as a whole at no charge to all third
       
   129     parties under the terms of this License.
       
   130 
       
   131     c) If the modified program normally reads commands interactively
       
   132     when run, you must cause it, when started running for such
       
   133     interactive use in the most ordinary way, to print or display an
       
   134     announcement including an appropriate copyright notice and a
       
   135     notice that there is no warranty (or else, saying that you provide
       
   136     a warranty) and that users may redistribute the program under
       
   137     these conditions, and telling the user how to view a copy of this
       
   138     License.  (Exception: if the Program itself is interactive but
       
   139     does not normally print such an announcement, your work based on
       
   140     the Program is not required to print an announcement.)
       
   141 
       
   142 These requirements apply to the modified work as a whole.  If
       
   143 identifiable sections of that work are not derived from the Program,
       
   144 and can be reasonably considered independent and separate works in
       
   145 themselves, then this License, and its terms, do not apply to those
       
   146 sections when you distribute them as separate works.  But when you
       
   147 distribute the same sections as part of a whole which is a work based
       
   148 on the Program, the distribution of the whole must be on the terms of
       
   149 this License, whose permissions for other licensees extend to the
       
   150 entire whole, and thus to each and every part regardless of who wrote it.
       
   151 
       
   152 Thus, it is not the intent of this section to claim rights or contest
       
   153 your rights to work written entirely by you; rather, the intent is to
       
   154 exercise the right to control the distribution of derivative or
       
   155 collective works based on the Program.
       
   156 
       
   157 In addition, mere aggregation of another work not based on the Program
       
   158 with the Program (or with a work based on the Program) on a volume of
       
   159 a storage or distribution medium does not bring the other work under
       
   160 the scope of this License.
       
   161 
       
   162   3. You may copy and distribute the Program (or a work based on it,
       
   163 under Section 2) in object code or executable form under the terms of
       
   164 Sections 1 and 2 above provided that you also do one of the following:
       
   165 
       
   166     a) Accompany it with the complete corresponding machine-readable
       
   167     source code, which must be distributed under the terms of Sections
       
   168     1 and 2 above on a medium customarily used for software interchange; or,
       
   169 
       
   170     b) Accompany it with a written offer, valid for at least three
       
   171     years, to give any third party, for a charge no more than your
       
   172     cost of physically performing source distribution, a complete
       
   173     machine-readable copy of the corresponding source code, to be
       
   174     distributed under the terms of Sections 1 and 2 above on a medium
       
   175     customarily used for software interchange; or,
       
   176 
       
   177     c) Accompany it with the information you received as to the offer
       
   178     to distribute corresponding source code.  (This alternative is
       
   179     allowed only for noncommercial distribution and only if you
       
   180     received the program in object code or executable form with such
       
   181     an offer, in accord with Subsection b above.)
       
   182 
       
   183 The source code for a work means the preferred form of the work for
       
   184 making modifications to it.  For an executable work, complete source
       
   185 code means all the source code for all modules it contains, plus any
       
   186 associated interface definition files, plus the scripts used to
       
   187 control compilation and installation of the executable.  However, as a
       
   188 special exception, the source code distributed need not include
       
   189 anything that is normally distributed (in either source or binary
       
   190 form) with the major components (compiler, kernel, and so on) of the
       
   191 operating system on which the executable runs, unless that component
       
   192 itself accompanies the executable.
       
   193 
       
   194 If distribution of executable or object code is made by offering
       
   195 access to copy from a designated place, then offering equivalent
       
   196 access to copy the source code from the same place counts as
       
   197 distribution of the source code, even though third parties are not
       
   198 compelled to copy the source along with the object code.
       
   199 
       
   200   4. You may not copy, modify, sublicense, or distribute the Program
       
   201 except as expressly provided under this License.  Any attempt
       
   202 otherwise to copy, modify, sublicense or distribute the Program is
       
   203 void, and will automatically terminate your rights under this License.
       
   204 However, parties who have received copies, or rights, from you under
       
   205 this License will not have their licenses terminated so long as such
       
   206 parties remain in full compliance.
       
   207 
       
   208   5. You are not required to accept this License, since you have not
       
   209 signed it.  However, nothing else grants you permission to modify or
       
   210 distribute the Program or its derivative works.  These actions are
       
   211 prohibited by law if you do not accept this License.  Therefore, by
       
   212 modifying or distributing the Program (or any work based on the
       
   213 Program), you indicate your acceptance of this License to do so, and
       
   214 all its terms and conditions for copying, distributing or modifying
       
   215 the Program or works based on it.
       
   216 
       
   217   6. Each time you redistribute the Program (or any work based on the
       
   218 Program), the recipient automatically receives a license from the
       
   219 original licensor to copy, distribute or modify the Program subject to
       
   220 these terms and conditions.  You may not impose any further
       
   221 restrictions on the recipients' exercise of the rights granted herein.
       
   222 You are not responsible for enforcing compliance by third parties to
       
   223 this License.
       
   224 
       
   225   7. If, as a consequence of a court judgment or allegation of patent
       
   226 infringement or for any other reason (not limited to patent issues),
       
   227 conditions are imposed on you (whether by court order, agreement or
       
   228 otherwise) that contradict the conditions of this License, they do not
       
   229 excuse you from the conditions of this License.  If you cannot
       
   230 distribute so as to satisfy simultaneously your obligations under this
       
   231 License and any other pertinent obligations, then as a consequence you
       
   232 may not distribute the Program at all.  For example, if a patent
       
   233 license would not permit royalty-free redistribution of the Program by
       
   234 all those who receive copies directly or indirectly through you, then
       
   235 the only way you could satisfy both it and this License would be to
       
   236 refrain entirely from distribution of the Program.
       
   237 
       
   238 If any portion of this section is held invalid or unenforceable under
       
   239 any particular circumstance, the balance of the section is intended to
       
   240 apply and the section as a whole is intended to apply in other
       
   241 circumstances.
       
   242 
       
   243 It is not the purpose of this section to induce you to infringe any
       
   244 patents or other property right claims or to contest validity of any
       
   245 such claims; this section has the sole purpose of protecting the
       
   246 integrity of the free software distribution system, which is
       
   247 implemented by public license practices.  Many people have made
       
   248 generous contributions to the wide range of software distributed
       
   249 through that system in reliance on consistent application of that
       
   250 system; it is up to the author/donor to decide if he or she is willing
       
   251 to distribute software through any other system and a licensee cannot
       
   252 impose that choice.
       
   253 
       
   254 This section is intended to make thoroughly clear what is believed to
       
   255 be a consequence of the rest of this License.
       
   256 
       
   257   8. If the distribution and/or use of the Program is restricted in
       
   258 certain countries either by patents or by copyrighted interfaces, the
       
   259 original copyright holder who places the Program under this License
       
   260 may add an explicit geographical distribution limitation excluding
       
   261 those countries, so that distribution is permitted only in or among
       
   262 countries not thus excluded.  In such case, this License incorporates
       
   263 the limitation as if written in the body of this License.
       
   264 
       
   265   9. The Free Software Foundation may publish revised and/or new versions
       
   266 of the General Public License from time to time.  Such new versions will
       
   267 be similar in spirit to the present version, but may differ in detail to
       
   268 address new problems or concerns.
       
   269 
       
   270 Each version is given a distinguishing version number.  If the Program
       
   271 specifies a version number of this License which applies to it and "any
       
   272 later version", you have the option of following the terms and conditions
       
   273 either of that version or of any later version published by the Free
       
   274 Software Foundation.  If the Program does not specify a version number of
       
   275 this License, you may choose any version ever published by the Free Software
       
   276 Foundation.
       
   277 
       
   278   10. If you wish to incorporate parts of the Program into other free
       
   279 programs whose distribution conditions are different, write to the author
       
   280 to ask for permission.  For software which is copyrighted by the Free
       
   281 Software Foundation, write to the Free Software Foundation; we sometimes
       
   282 make exceptions for this.  Our decision will be guided by the two goals
       
   283 of preserving the free status of all derivatives of our free software and
       
   284 of promoting the sharing and reuse of software generally.
       
   285 
       
   286                             NO WARRANTY
       
   287 
       
   288   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
       
   289 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
       
   290 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
       
   291 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
       
   292 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
       
   293 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
       
   294 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
       
   295 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
       
   296 REPAIR OR CORRECTION.
       
   297 
       
   298   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
       
   299 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
       
   300 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
       
   301 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
       
   302 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
       
   303 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
       
   304 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
       
   305 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
       
   306 POSSIBILITY OF SUCH DAMAGES.
       
   307 
       
   308                      END OF TERMS AND CONDITIONS
       
   309 
       
   310             How to Apply These Terms to Your New Programs
       
   311 
       
   312   If you develop a new program, and you want it to be of the greatest
       
   313 possible use to the public, the best way to achieve this is to make it
       
   314 free software which everyone can redistribute and change under these terms.
       
   315 
       
   316   To do so, attach the following notices to the program.  It is safest
       
   317 to attach them to the start of each source file to most effectively
       
   318 convey the exclusion of warranty; and each file should have at least
       
   319 the "copyright" line and a pointer to where the full notice is found.
       
   320 
       
   321     <one line to give the program's name and a brief idea of what it does.>
       
   322     Copyright (C) <year>  <name of author>
       
   323 
       
   324     This program is free software; you can redistribute it and/or modify
       
   325     it under the terms of the GNU General Public License as published by
       
   326     the Free Software Foundation; either version 2 of the License, or
       
   327     (at your option) any later version.
       
   328 
       
   329     This program is distributed in the hope that it will be useful,
       
   330     but WITHOUT ANY WARRANTY; without even the implied warranty of
       
   331     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
       
   332     GNU General Public License for more details.
       
   333 
       
   334     You should have received a copy of the GNU General Public License
       
   335     along with this program; if not, write to the Free Software
       
   336     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
       
   337 
       
   338 
       
   339 Also add information on how to contact you by electronic and paper mail.
       
   340 
       
   341 If the program is interactive, make it output a short notice like this
       
   342 when it starts in an interactive mode:
       
   343 
       
   344     Gnomovision version 69, Copyright (C) year name of author
       
   345     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
       
   346     This is free software, and you are welcome to redistribute it
       
   347     under certain conditions; type `show c' for details.
       
   348 
       
   349 The hypothetical commands `show w' and `show c' should show the appropriate
       
   350 parts of the General Public License.  Of course, the commands you use may
       
   351 be called something other than `show w' and `show c'; they could even be
       
   352 mouse-clicks or menu items--whatever suits your program.
       
   353 
       
   354 You should also get your employer (if you work as a programmer) or your
       
   355 school, if any, to sign a "copyright disclaimer" for the program, if
       
   356 necessary.  Here is a sample; alter the names:
       
   357 
       
   358   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
       
   359   `Gnomovision' (which makes passes at compilers) written by James Hacker.
       
   360 
       
   361   <signature of Ty Coon>, 1 April 1989
       
   362   Ty Coon, President of Vice
       
   363 
       
   364 This General Public License does not permit incorporating your program into
       
   365 proprietary programs.  If your program is a subroutine library, you may
       
   366 consider it more useful to permit linking proprietary applications with the
       
   367 library.  If this is what you want to do, use the GNU Library General
       
   368 Public License instead of this License.