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