COPYING

   1 == License and copyright information ==
   2
   3 === License ===
   4
   5 MediaWiki is licensed under the terms of the GNU General Public License,
   6 version 2 or later. Derivative works and later versions of the code must be
   7 free software licensed under the same or a compatible license. This includes
   8 "extensions" that use MediaWiki functions or variables; see
   9 http://www.gnu.org/licenses/gpl-faq.html#GPLAndPlugins for details.
  10
  11 For the full text of version 2 of the license, see
  12 https://www.gnu.org/licenses/gpl-2.0.html or '''GNU General Public License'''
  13 below.
  14
  15 === Copyright owners ===
  16
  17 MediaWiki contributors, including those listed in the CREDITS file, hold the
  18 copyright to this work.
  19
  20 === Additional license information ===
  21
  22 Some components of MediaWiki imported from other projects may be under other
  23 Free and Open Source, or Free Culture, licenses. Specific details of their
  24 licensing information can be found in those components.
  25
  26 Sections of code written exclusively by Lee Crocker or Erik Moeller are also
  27 released into the public domain, which does not impair the obligations of users
  28 under the GPL for use of the whole code or other sections thereof.
  29
  30 MediaWiki uses the following Creative Commons icons to illustrate links to the
  31 CC licenses:
  32
  33 * resources/assets/licenses/cc-0.png
  34 * resources/assets/licenses/cc-by-nc-sa.png
  35 * resources/assets/licenses/cc-by-sa.png
  36 * resources/assets/licenses/cc-by.png
  37
  38 These icons are trademarked, and used subject to the CC trademark license,
  39 available at http://creativecommons.org/policies#trademark
  40
  41 == GNU GENERAL PUBLIC LICENSE ==
  42
  43 Version 2, June 1991
  44
  45 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
  46 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  47 Everyone is permitted to copy and distribute verbatim copies
  48 of this license document, but changing it is not allowed.
  49
  50 === Preamble ===
  51
  52 The licenses for most software are designed to take away your
  53 freedom to share and change it.  By contrast, the GNU General Public
  54 License is intended to guarantee your freedom to share and change free
  55 software--to make sure the software is free for all its users.  This
  56 General Public License applies to most of the Free Software
  57 Foundation's software and to any other program whose authors commit to
  58 using it.  (Some other Free Software Foundation software is covered by
  59 the GNU Library General Public License instead.)  You can apply it to
  60 your programs, too.
  61
  62 When we speak of free software, we are referring to freedom, not
  63 price.  Our General Public Licenses are designed to make sure that you
  64 have the freedom to distribute copies of free software (and charge for
  65 this service if you wish), that you receive source code or can get it
  66 if you want it, that you can change the software or use pieces of it
  67 in new free programs; and that you know you can do these things.
  68
  69 To protect your rights, we need to make restrictions that forbid
  70 anyone to deny you these rights or to ask you to surrender the rights.
  71 These restrictions translate to certain responsibilities for you if you
  72 distribute copies of the software, or if you modify it.
  73
  74 For example, if you distribute copies of such a program, whether
  75 gratis or for a fee, you must give the recipients all the rights that
  76 you have.  You must make sure that they, too, receive or can get the
  77 source code.  And you must show them these terms so they know their
  78 rights.
  79
  80 We protect your rights with two steps: (1) copyright the software, and
  81 (2) offer you this license which gives you legal permission to copy,
  82 distribute and/or modify the software.
  83
  84 Also, for each author's protection and ours, we want to make certain
  85 that everyone understands that there is no warranty for this free
  86 software.  If the software is modified by someone else and passed on, we
  87 want its recipients to know that what they have is not the original, so
  88 that any problems introduced by others will not reflect on the original
  89 authors' reputations.
  90
  91 Finally, any free program is threatened constantly by software
  92 patents.  We wish to avoid the danger that redistributors of a free
  93 program will individually obtain patent licenses, in effect making the
  94 program proprietary.  To prevent this, we have made it clear that any
  95 patent must be licensed for everyone's free use or not licensed at all.
  96
  97 The precise terms and conditions for copying, distribution and
  98 modification follow.
  99
 100 == TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION ==
 101
 102 '''0.''' This License applies to any program or other work which contains
 103 a notice placed by the copyright holder saying it may be distributed
 104 under the terms of this General Public License.  The "Program", below,
 105 refers to any such program or work, and a "work based on the Program"
 106 means either the Program or any derivative work under copyright law:
 107 that is to say, a work containing the Program or a portion of it,
 108 either verbatim or with modifications and/or translated into another
 109 language.  (Hereinafter, translation is included without limitation in
 110 the term "modification".)  Each licensee is addressed as "you".
 111
 112 Activities other than copying, distribution and modification are not
 113 covered by this License; they are outside its scope.  The act of
 114 running the Program is not restricted, and the output from the Program
 115 is covered only if its contents constitute a work based on the
 116 Program (independent of having been made by running the Program).
 117 Whether that is true depends on what the Program does.
 118
 119 '''1.''' You may copy and distribute verbatim copies of the Program's
 120 source code as you receive it, in any medium, provided that you
 121 conspicuously and appropriately publish on each copy an appropriate
 122 copyright notice and disclaimer of warranty; keep intact all the
 123 notices that refer to this License and to the absence of any warranty;
 124 and give any other recipients of the Program a copy of this License
 125 along with the Program.
 126
 127 You may charge a fee for the physical act of transferring a copy, and
 128 you may at your option offer warranty protection in exchange for a fee.
 129
 130 '''2.''' You may modify your copy or copies of the Program or any portion
 131 of it, thus forming a work based on the Program, and copy and
 132 distribute such modifications or work under the terms of Section 1
 133 above, provided that you also meet all of these conditions:
 134
 135         '''a)''' You must cause the modified files to carry prominent notices
 136         stating that you changed the files and the date of any change.
 137
 138         '''b)''' You must cause any work that you distribute or publish, that in
 139         whole or in part contains or is derived from the Program or any
 140         part thereof, to be licensed as a whole at no charge to all third
 141         parties under the terms of this License.
 142
 143         '''c)''' If the modified program normally reads commands interactively
 144         when run, you must cause it, when started running for such
 145         interactive use in the most ordinary way, to print or display an
 146         announcement including an appropriate copyright notice and a
 147         notice that there is no warranty (or else, saying that you provide
 148         a warranty) and that users may redistribute the program under
 149         these conditions, and telling the user how to view a copy of this
 150         License.  (Exception: if the Program itself is interactive but
 151         does not normally print such an announcement, your work based on
 152         the Program is not required to print an announcement.)
 153
 154 These requirements apply to the modified work as a whole.  If
 155 identifiable sections of that work are not derived from the Program,
 156 and can be reasonably considered independent and separate works in
 157 themselves, then this License, and its terms, do not apply to those
 158 sections when you distribute them as separate works.  But when you
 159 distribute the same sections as part of a whole which is a work based
 160 on the Program, the distribution of the whole must be on the terms of
 161 this License, whose permissions for other licensees extend to the
 162 entire whole, and thus to each and every part regardless of who wrote it.
 163
 164 Thus, it is not the intent of this section to claim rights or contest
 165 your rights to work written entirely by you; rather, the intent is to
 166 exercise the right to control the distribution of derivative or
 167 collective works based on the Program.
 168
 169 In addition, mere aggregation of another work not based on the Program
 170 with the Program (or with a work based on the Program) on a volume of
 171 a storage or distribution medium does not bring the other work under
 172 the scope of this License.
 173
 174 '''3.''' You may copy and distribute the Program (or a work based on it,
 175 under Section 2) in object code or executable form under the terms of
 176 Sections 1 and 2 above provided that you also do one of the following:
 177
 178         '''a)''' Accompany it with the complete corresponding machine-readable
 179         source code, which must be distributed under the terms of Sections
 180         1 and 2 above on a medium customarily used for software interchange; or,
 181
 182         '''b)''' Accompany it with a written offer, valid for at least three
 183         years, to give any third party, for a charge no more than your
 184         cost of physically performing source distribution, a complete
 185         machine-readable copy of the corresponding source code, to be
 186         distributed under the terms of Sections 1 and 2 above on a medium
 187         customarily used for software interchange; or,
 188
 189         '''c)''' Accompany it with the information you received as to the offer
 190         to distribute corresponding source code.  (This alternative is
 191         allowed only for noncommercial distribution and only if you
 192         received the program in object code or executable form with such
 193         an offer, in accord with Subsection b above.)
 194
 195 The source code for a work means the preferred form of the work for
 196 making modifications to it.  For an executable work, complete source
 197 code means all the source code for all modules it contains, plus any
 198 associated interface definition files, plus the scripts used to
 199 control compilation and installation of the executable.  However, as a
 200 special exception, the source code distributed need not include
 201 anything that is normally distributed (in either source or binary
 202 form) with the major components (compiler, kernel, and so on) of the
 203 operating system on which the executable runs, unless that component
 204 itself accompanies the executable.
 205
 206 If distribution of executable or object code is made by offering
 207 access to copy from a designated place, then offering equivalent
 208 access to copy the source code from the same place counts as
 209 distribution of the source code, even though third parties are not
 210 compelled to copy the source along with the object code.
 211
 212 '''4.''' You may not copy, modify, sublicense, or distribute the Program
 213 except as expressly provided under this License.  Any attempt
 214 otherwise to copy, modify, sublicense or distribute the Program is
 215 void, and will automatically terminate your rights under this License.
 216 However, parties who have received copies, or rights, from you under
 217 this License will not have their licenses terminated so long as such
 218 parties remain in full compliance.
 219
 220 '''5.''' You are not required to accept this License, since you have not
 221 signed it.  However, nothing else grants you permission to modify or
 222 distribute the Program or its derivative works.  These actions are
 223 prohibited by law if you do not accept this License.  Therefore, by
 224 modifying or distributing the Program (or any work based on the
 225 Program), you indicate your acceptance of this License to do so, and
 226 all its terms and conditions for copying, distributing or modifying
 227 the Program or works based on it.
 228
 229 '''6.''' Each time you redistribute the Program (or any work based on the
 230 Program), the recipient automatically receives a license from the
 231 original licensor to copy, distribute or modify the Program subject to
 232 these terms and conditions.  You may not impose any further
 233 restrictions on the recipients' exercise of the rights granted herein.
 234 You are not responsible for enforcing compliance by third parties to
 235 this License.
 236
 237 '''7.''' If, as a consequence of a court judgment or allegation of patent
 238 infringement or for any other reason (not limited to patent issues),
 239 conditions are imposed on you (whether by court order, agreement or
 240 otherwise) that contradict the conditions of this License, they do not
 241 excuse you from the conditions of this License.  If you cannot
 242 distribute so as to satisfy simultaneously your obligations under this
 243 License and any other pertinent obligations, then as a consequence you
 244 may not distribute the Program at all.  For example, if a patent
 245 license would not permit royalty-free redistribution of the Program by
 246 all those who receive copies directly or indirectly through you, then
 247 the only way you could satisfy both it and this License would be to
 248 refrain entirely from distribution of the Program.
 249
 250 If any portion of this section is held invalid or unenforceable under
 251 any particular circumstance, the balance of the section is intended to
 252 apply and the section as a whole is intended to apply in other
 253 circumstances.
 254
 255 It is not the purpose of this section to induce you to infringe any
 256 patents or other property right claims or to contest validity of any
 257 such claims; this section has the sole purpose of protecting the
 258 integrity of the free software distribution system, which is
 259 implemented by public license practices.  Many people have made
 260 generous contributions to the wide range of software distributed
 261 through that system in reliance on consistent application of that
 262 system; it is up to the author/donor to decide if he or she is willing
 263 to distribute software through any other system and a licensee cannot
 264 impose that choice.
 265
 266 This section is intended to make thoroughly clear what is believed to
 267 be a consequence of the rest of this License.
 268
 269 '''8.''' If the distribution and/or use of the Program is restricted in
 270 certain countries either by patents or by copyrighted interfaces, the
 271 original copyright holder who places the Program under this License
 272 may add an explicit geographical distribution limitation excluding
 273 those countries, so that distribution is permitted only in or among
 274 countries not thus excluded.  In such case, this License incorporates
 275 the limitation as if written in the body of this License.
 276
 277 '''9.''' The Free Software Foundation may publish revised and/or new versions
 278 of the General Public License from time to time.  Such new versions will
 279 be similar in spirit to the present version, but may differ in detail to
 280 address new problems or concerns.
 281
 282 Each version is given a distinguishing version number.  If the Program
 283 specifies a version number of this License which applies to it and "any
 284 later version", you have the option of following the terms and conditions
 285 either of that version or of any later version published by the Free
 286 Software Foundation.  If the Program does not specify a version number of
 287 this License, you may choose any version ever published by the Free Software
 288 Foundation.
 289
 290 '''10.''' If you wish to incorporate parts of the Program into other free
 291 programs whose distribution conditions are different, write to the author
 292 to ask for permission.  For software which is copyrighted by the Free
 293 Software Foundation, write to the Free Software Foundation; we sometimes
 294 make exceptions for this.  Our decision will be guided by the two goals
 295 of preserving the free status of all derivatives of our free software and
 296 of promoting the sharing and reuse of software generally.
 297
 298 === NO WARRANTY ===
 299
 300 '''11.''' BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 301 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 302 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 303 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 304 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 305 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 306 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 307 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 308 REPAIR OR CORRECTION.
 309
 310 '''12.''' IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 311 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 312 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 313 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 314 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 315 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 316 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 317 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 318 POSSIBILITY OF SUCH DAMAGES.
 319
 320         '''END OF TERMS AND CONDITIONS'''
 321
 322 == How to Apply These Terms to Your New Programs ==
 323
 324 If you develop a new program, and you want it to be of the greatest
 325 possible use to the public, the best way to achieve this is to make it
 326 free software which everyone can redistribute and change under these terms.
 327
 328 To do so, attach the following notices to the program.  It is safest
 329 to attach them to the start of each source file to most effectively
 330 convey the exclusion of warranty; and each file should have at least
 331 the "copyright" line and a pointer to where the full notice is found.
 332
 333         <one line to give the program's name and a brief idea of what it does.>
 334
 335         Copyright (C) <year>  <name of author>
 336
 337         This program is free software; you can redistribute it and/or modify
 338         it under the terms of the GNU General Public License as published by
 339         the Free Software Foundation; either version 2 of the License, or
 340         (at your option) any later version.
 341
 342         This program is distributed in the hope that it will be useful,
 343         but WITHOUT ANY WARRANTY; without even the implied warranty of
 344         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 345         GNU General Public License for more details.
 346
 347         You should have received a copy of the GNU General Public License
 348         along with this program; if not, write to the Free Software
 349         Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 350
 351
 352 Also add information on how to contact you by electronic and paper mail.
 353
 354 If the program is interactive, make it output a short notice like this
 355 when it starts in an interactive mode:
 356
 357         Gnomovision version 69, Copyright (C) year name of author
 358         Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
 359         This is free software, and you are welcome to redistribute it
 360         under certain conditions; type `show c' for details.
 361
 362 The hypothetical commands `show w' and `show c' should show the appropriate
 363 parts of the General Public License.  Of course, the commands you use may
 364 be called something other than `show w' and `show c'; they could even be
 365 mouse-clicks or menu items--whatever suits your program.
 366
 367 You should also get your employer (if you work as a programmer) or your
 368 school, if any, to sign a "copyright disclaimer" for the program, if
 369 necessary.  Here is a sample; alter the names:
 370
 371         Yoyodyne, Inc., hereby disclaims all copyright interest in the program
 372         `Gnomovision' (which makes passes at compilers) written by James Hacker.
 373
 374         <signature of Ty Coon>, 1 April 1989
 375
 376         Ty Coon, President of Vice
 377
 378 This General Public License does not permit incorporating your program into
 379 proprietary programs.  If your program is a subroutine library, you may
 380 consider it more useful to permit linking proprietary applications with the
 381 library.  If this is what you want to do, use the GNU Library General
 382 Public License instead of this License.