LICENSES/GPL-2.0

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