license.txt
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- GNU GENERAL PUBLIC LICENSE 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
-
- Appendix: How to Apply These Terms to Your New Programs
- If you develop a new program, and you want it to be of the greatest
- possible use to the public, the best way to achieve this is to make it free
- software which everyone can redistribute and change under these terms.
- To do so, attach the following notices to the program. It is safest to
- attach them to the start of each source file to most effectively convey the
- exclusion of warranty; and each file should have at least the "copyright"
- line and a pointer to where the full notice is found.
- <one line to give the program's name and a brief idea of what it does.>
- Copyright (C) 19yy <name of author>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- Also add information on how to contact you by electronic and paper mail.
- If the program is interactive, make it output a short notice like this when
- it starts in an interactive mode:
- Gnomovision version 69, Copyright (C) 19yy name of author
- Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
- This is free software, and you are welcome to redistribute it
- under certain conditions; type `show c' for details.
- The hypothetical commands `show w' and `show c' should show the appropriate
- parts of the General Public License. Of course, the commands you use may be
- called something other than `show w' and `show c'; they could even be
- mouse-clicks or menu items--whatever suits your program.
- You should also get your employer (if you work as a programmer) or your
- school, if any, to sign a "copyright disclaimer" for the program, if
- necessary. Here is a sample; alter the names:
- Yoyodyne, Inc., hereby disclaims all copyright interest in the program
- `Gnomovision' (which makes passes at compilers) written by James Hacker.
- <signature of Ty Coon>, 1 April 1989 Ty Coon, President of Vice
- This General Public License does not permit incorporating your program into
- proprietary programs. If your program is a subroutine library, you may
- consider it more useful to permit linking proprietary applications with the
- library. If this is what you want to do, use the GNU Library General Public
- License instead of this License.