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- The General Public License (GPL)
- Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass Ave,
- Cambridge, MA 02139, USA. Everyone is permitted to copy and distribute
- verbatim copies of this license document, but changing it is not allowed.
-
- Preamble
-
- The licenses for most software are designed to take away your freedom to share
- and change it. By contrast, the GNU General Public License is intended to
- guarantee your freedom to share and change free software--to make sure the
- software is free for all its users. This General Public License applies to most of
- the Free Software Foundation's software and to any other program whose
- authors commit to using it. (Some other Free Software Foundation software is
- covered by the GNU Library General Public License instead.) You can apply it to
- your programs, too.
-
- When we speak of free software, we are referring to freedom, not price. Our
- General Public Licenses are designed to make sure that you have the freedom
- to distribute copies of free software (and charge for this service if you wish), that
- you receive source code or can get it if you want it, that you can change the
- software or use pieces of it in new free programs; and that you know you can do
- these things.
-
- To protect your rights, we need to make restrictions that forbid anyone to deny
- you these rights or to ask you to surrender the rights. These restrictions
- translate to certain responsibilities for you if you distribute copies of the
- software, or if you modify it.
-
- For example, if you distribute copies of such a program, whether gratis or for a
- fee, you must give the recipients all the rights that you have. You must make
- sure that they, too, receive or can get the source code. And you must show
- them these terms so they know their rights.
-
- We protect your rights with two steps: (1) copyright the software, and (2) offer
- you this license which gives you legal permission to copy, distribute and/or
- modify the software.
-
- Also, for each author's protection and ours, we want to make certain that
- everyone understands that there is no warranty for this free software. If the
- software is modified by someone else and passed on, we want its recipients to
- know that what they have is not the original, so that any problems introduced by
- others will not reflect on the original authors' reputations.
-
- Finally, any free program is threatened constantly by software patents. We wish
- to avoid the danger that redistributors of a free program will individually obtain
- patent licenses, in effect making the program proprietary. To prevent this, we
- have made it clear that any patent must be licensed for everyone's free use or
- not licensed at all.
-
- The precise terms and conditions for copying, distribution and modification
- follow.
-
- GNU GENERAL PUBLIC LICENSE
- TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND
- MODIFICATION
-
- 0. This License applies to any program or other work which contains a notice
- placed by the copyright holder saying it may be distributed under the terms of
- this General Public License. The "Program", below, refers to any such program
- or work, and a "work based on the Program" means either the Program or any
- derivative work under copyright law: that is to say, a work containing the
- Program or a portion of it, either verbatim or with modifications and/or translated
- into another language. (Hereinafter, translation is included without limitation in
- the term "modification".) Each licensee is addressed as "you".
-
- Activities other than copying, distribution and modification are not covered by
- this License; they are outside its scope. The act of running the Program is not
- restricted, and the output from the Program is covered only if its contents
- constitute a work based on the Program (independent of having been made by
- running the Program). Whether that is true depends on what the Program does.
-
- 1. You may copy and distribute verbatim copies of the Program's source code as
- you receive it, in any medium, provided that you conspicuously and appropriately
- publish on each copy an appropriate copyright notice and disclaimer of warranty;
- keep intact all the notices that refer to this License and to the absence of any
- warranty; and give any other recipients of the Program a copy of this License
- along with the Program.
-
- You may charge a fee for the physical act of transferring a copy, and you may at
- your option offer warranty protection in exchange for a fee.
-
- 2. You may modify your copy or copies of the Program or any portion of it, thus
- forming a work based on the Program, and copy and distribute such
- modifications or work under the terms of Section 1 above, provided that you also
- meet all of these conditions:
-
- a) You must cause the modified files to carry prominent notices stating that you
- changed the files and the date of any change.
-
- b) You must cause any work that you distribute or publish, that in whole or in
- part contains or is derived from the Program or any part thereof, to be licensed
- as a whole at no charge to all third parties under the terms of this License.
-
- c) If the modified program normally reads commands interactively when run, you
- must cause it, when started running for such interactive use in the most ordinary
- way, to print or display an announcement including an appropriate copyright
- notice and a notice that there is no warranty (or else, saying that you provide a
- warranty) and that users may redistribute the program under these conditions,
- and telling the user how to view a copy of this License. (Exception: if the
- Program itself is interactive but does not normally print such an announcement,
- your work based on the Program is not required to print an announcement.)
-
- These requirements apply to the modified work as a whole. If identifiable
- sections of that work are not derived from the Program, and can be reasonably
- considered independent and separate works in themselves, then this License,
- and its terms, do not apply to those sections when you distribute them as
- separate works. But when you distribute the same sections as part of a whole
- which is a work based on the Program, the distribution of the whole must be on
- the terms of this License, whose permissions for other licensees extend to the
- entire whole, and thus to each and every part regardless of who wrote it.
-
- Thus, it is not the intent of this section to claim rights or contest your rights to
- work written entirely by you; rather, the intent is to exercise the right to control
- the distribution of derivative or collective works based on the Program.
-
- In addition, mere aggregation of another work not based on the Program with the
- Program (or with a work based on the Program) on a volume of a storage or
- distribution medium does not bring the other work under the scope of this
- License.
-
- 3. You may copy and distribute the Program (or a work based on it, under
- Section 2) in object code or executable form under the terms of Sections 1 and 2
- above provided that you also do one of the following:
-
- a) Accompany it with the complete corresponding machine-readable source
- code, which must be distributed under the terms of Sections 1 and 2 above on a
- medium customarily used for software interchange; or,
-
- b) Accompany it with a written offer, valid for at least three years, to give any
- third party, for a charge no more than your cost of physically performing source
- distribution, a complete machine-readable copy of the corresponding source
- code, to be distributed under the terms of Sections 1 and 2 above on a medium
- customarily used for software interchange; or,
-
- c) Accompany it with the information you received as to the offer to distribute
- corresponding source code. (This alternative is allowed only for noncommercial
- distribution and only if you received the program in object code or executable
- form with such an offer, in accord with Subsection b above.)
-
- The source code for a work means the preferred form of the work for making
- modifications to it. For an executable work, complete source code means all the
- source code for all modules it contains, plus any associated interface definition
- files, plus the scripts used to control compilation and installation of the
- executable. However, as a special exception, the source code distributed need
- not include anything that is normally distributed (in either source or binary form)
- with the major components (compiler, kernel, and so on) of the operating system
- on which the executable runs, unless that component itself accompanies the
- executable.
-
- If distribution of executable or object code is made by offering access to copy
- from a designated place, then offering equivalent access to copy the source
- code from the same place counts as distribution of the source code, even though
- third parties are not compelled to copy the source along with the object code.
-
- 4. You may not copy, modify, sublicense, or distribute the Program except as
- expressly provided under this License. Any attempt otherwise to copy, modify,
- sublicense or distribute the Program is void, and will automatically terminate
- your rights under this License. However, parties who have received copies, or
- rights, from you under this License will not have their licenses terminated so long
- as such parties remain in full compliance.
-
- 5. You are not required to accept this License, since you have not signed it.
- However, nothing else grants you permission to modify or distribute the Program
- or its derivative works. These actions are prohibited by law if you do not accept
- this License. Therefore, by modifying or distributing the Program (or any work
- based on the Program), you indicate your acceptance of this License to do so,
- and all its terms and conditions for copying, distributing or modifying the
- Program or works based on it.
-
- 6. Each time you redistribute the Program (or any work based on the Program),
- the recipient automatically receives a license from the original licensor to copy,
- distribute or modify the Program subject to these terms and conditions. You
- may not impose any further restrictions on the recipients' exercise of the rights
- granted herein. You are not responsible for enforcing compliance by third parties
- to this License.
-
- 7. If, as a consequence of a court judgment or allegation of patent infringement
- or for any other reason (not limited to patent issues), conditions are imposed on
- you (whether by court order, agreement or otherwise) that contradict the
- conditions of this License, they do not excuse you from the conditions of this
- License. If you cannot distribute so as to satisfy simultaneously your obligations
- under this License and any other pertinent obligations, then as a consequence
- you may not distribute the Program at all. For example, if a patent license would
- not permit royalty-free redistribution of the Program by all those who receive
- copies directly or indirectly through you, then the only way you could satisfy
- both it and this License would be to refrain entirely from distribution of the
- Program.
-
- If any portion of this section is held invalid or unenforceable under any particular
- circumstance, the balance of the section is intended to apply and the section as
- a whole is intended to apply in other circumstances.
-
- It is not the purpose of this section to induce you to infringe any patents or other
- property right claims or to contest validity of any such claims; this section has
- the sole purpose of protecting the integrity of the free software distribution
- system, which is implemented by public license practices. Many people have
- made generous contributions to the wide range of software distributed through
- that system in reliance on consistent application of that system; it is up to the
- author/donor to decide if he or she is willing to distribute software through any
- other system and a licensee cannot impose that choice.
-
- This section is intended to make thoroughly clear what is believed to be a
- consequence of the rest of this License.
-
- 8. If the distribution and/or use of the Program is restricted in certain countries
- either by patents or by copyrighted interfaces, the original copyright holder who
- places the Program under this License may add an explicit geographical
- distribution limitation excluding those countries, so that distribution is permitted
- only in or among countries not thus excluded. In such case, this License
- incorporates the limitation as if written in the body of this License.
-
- 9. The Free Software Foundation may publish revised and/or new versions of the
- General Public License from time to time. Such new versions will be similar in
- spirit to the present version, but may differ in detail to address new problems or
- concerns.
-
- Each version is given a distinguishing version number. If the Program specifies a
- version number of this License which applies to it and "any later version", you
- have the option of following the terms and conditions either of that version or of
- any later version published by the Free Software Foundation. If the Program does
- not specify a version number of this License, you may choose any version ever
- published by the Free Software Foundation.
-
- 10. If you wish to incorporate parts of the Program into other free programs
- whose distribution conditions are different, write to the author to ask for
- permission. For software which is copyrighted by the Free Software Foundation,
- write to the Free Software Foundation; we sometimes make exceptions for this.
- Our decision will be guided by the two goals of preserving the free status of all
- derivatives of our free software and of promoting the sharing and reuse of
- software generally.
-
- NO WARRANTY
-
- 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS
- NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
- APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
- COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM
- "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR
- IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
- ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
- PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE,
- YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
- CORRECTION.
-
- 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED
- TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY
- WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS
- PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
- GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
- ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM
- (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
- RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
- PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
- OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS
- BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
-
- END OF TERMS AND CONDITIONS
-