5 kx GNU GENERAL PUBLIC LICENSE
5 kx Version 2, June 1991
5 kx
5 kx Copyright (C) 1989, 1991 Free Software Foundation, Inc.
5 kx 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
5 kx Everyone is permitted to copy and distribute verbatim copies
5 kx of this license document, but changing it is not allowed.
5 kx
5 kx Preamble
5 kx
5 kx The licenses for most software are designed to take away your
5 kx freedom to share and change it. By contrast, the GNU General Public
5 kx License is intended to guarantee your freedom to share and change free
5 kx software--to make sure the software is free for all its users. This
5 kx General Public License applies to most of the Free Software
5 kx Foundation's software and to any other program whose authors commit to
5 kx using it. (Some other Free Software Foundation software is covered by
5 kx the GNU Library General Public License instead.) You can apply it to
5 kx your programs, too.
5 kx
5 kx When we speak of free software, we are referring to freedom, not
5 kx price. Our General Public Licenses are designed to make sure that you
5 kx have the freedom to distribute copies of free software (and charge for
5 kx this service if you wish), that you receive source code or can get it
5 kx if you want it, that you can change the software or use pieces of it
5 kx in new free programs; and that you know you can do these things.
5 kx
5 kx To protect your rights, we need to make restrictions that forbid
5 kx anyone to deny you these rights or to ask you to surrender the rights.
5 kx These restrictions translate to certain responsibilities for you if you
5 kx distribute copies of the software, or if you modify it.
5 kx
5 kx For example, if you distribute copies of such a program, whether
5 kx gratis or for a fee, you must give the recipients all the rights that
5 kx you have. You must make sure that they, too, receive or can get the
5 kx source code. And you must show them these terms so they know their
5 kx rights.
5 kx
5 kx We protect your rights with two steps: (1) copyright the software, and
5 kx (2) offer you this license which gives you legal permission to copy,
5 kx distribute and/or modify the software.
5 kx
5 kx Also, for each author's protection and ours, we want to make certain
5 kx that everyone understands that there is no warranty for this free
5 kx software. If the software is modified by someone else and passed on, we
5 kx want its recipients to know that what they have is not the original, so
5 kx that any problems introduced by others will not reflect on the original
5 kx authors' reputations.
5 kx
5 kx Finally, any free program is threatened constantly by software
5 kx patents. We wish to avoid the danger that redistributors of a free
5 kx program will individually obtain patent licenses, in effect making the
5 kx program proprietary. To prevent this, we have made it clear that any
5 kx patent must be licensed for everyone's free use or not licensed at all.
5 kx
5 kx The precise terms and conditions for copying, distribution and
5 kx modification follow.
5 kx
5 kx GNU GENERAL PUBLIC LICENSE
5 kx TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
5 kx
5 kx 0. This License applies to any program or other work which contains
5 kx a notice placed by the copyright holder saying it may be distributed
5 kx under the terms of this General Public License. The "Program", below,
5 kx refers to any such program or work, and a "work based on the Program"
5 kx means either the Program or any derivative work under copyright law:
5 kx that is to say, a work containing the Program or a portion of it,
5 kx either verbatim or with modifications and/or translated into another
5 kx language. (Hereinafter, translation is included without limitation in
5 kx the term "modification".) Each licensee is addressed as "you".
5 kx
5 kx Activities other than copying, distribution and modification are not
5 kx covered by this License; they are outside its scope. The act of
5 kx running the Program is not restricted, and the output from the Program
5 kx is covered only if its contents constitute a work based on the
5 kx Program (independent of having been made by running the Program).
5 kx Whether that is true depends on what the Program does.
5 kx
5 kx 1. You may copy and distribute verbatim copies of the Program's
5 kx source code as you receive it, in any medium, provided that you
5 kx conspicuously and appropriately publish on each copy an appropriate
5 kx copyright notice and disclaimer of warranty; keep intact all the
5 kx notices that refer to this License and to the absence of any warranty;
5 kx and give any other recipients of the Program a copy of this License
5 kx along with the Program.
5 kx
5 kx You may charge a fee for the physical act of transferring a copy, and
5 kx you may at your option offer warranty protection in exchange for a fee.
5 kx
5 kx 2. You may modify your copy or copies of the Program or any portion
5 kx of it, thus forming a work based on the Program, and copy and
5 kx distribute such modifications or work under the terms of Section 1
5 kx above, provided that you also meet all of these conditions:
5 kx
5 kx a) You must cause the modified files to carry prominent notices
5 kx stating that you changed the files and the date of any change.
5 kx
5 kx b) You must cause any work that you distribute or publish, that in
5 kx whole or in part contains or is derived from the Program or any
5 kx part thereof, to be licensed as a whole at no charge to all third
5 kx parties under the terms of this License.
5 kx
5 kx c) If the modified program normally reads commands interactively
5 kx when run, you must cause it, when started running for such
5 kx interactive use in the most ordinary way, to print or display an
5 kx announcement including an appropriate copyright notice and a
5 kx notice that there is no warranty (or else, saying that you provide
5 kx a warranty) and that users may redistribute the program under
5 kx these conditions, and telling the user how to view a copy of this
5 kx License. (Exception: if the Program itself is interactive but
5 kx does not normally print such an announcement, your work based on
5 kx the Program is not required to print an announcement.)
5 kx
5 kx These requirements apply to the modified work as a whole. If
5 kx identifiable sections of that work are not derived from the Program,
5 kx and can be reasonably considered independent and separate works in
5 kx themselves, then this License, and its terms, do not apply to those
5 kx sections when you distribute them as separate works. But when you
5 kx distribute the same sections as part of a whole which is a work based
5 kx on the Program, the distribution of the whole must be on the terms of
5 kx this License, whose permissions for other licensees extend to the
5 kx entire whole, and thus to each and every part regardless of who wrote it.
5 kx
5 kx Thus, it is not the intent of this section to claim rights or contest
5 kx your rights to work written entirely by you; rather, the intent is to
5 kx exercise the right to control the distribution of derivative or
5 kx collective works based on the Program.
5 kx
5 kx In addition, mere aggregation of another work not based on the Program
5 kx with the Program (or with a work based on the Program) on a volume of
5 kx a storage or distribution medium does not bring the other work under
5 kx the scope of this License.
5 kx
5 kx 3. You may copy and distribute the Program (or a work based on it,
5 kx under Section 2) in object code or executable form under the terms of
5 kx Sections 1 and 2 above provided that you also do one of the following:
5 kx
5 kx a) Accompany it with the complete corresponding machine-readable
5 kx source code, which must be distributed under the terms of Sections
5 kx 1 and 2 above on a medium customarily used for software interchange; or,
5 kx
5 kx b) Accompany it with a written offer, valid for at least three
5 kx years, to give any third party, for a charge no more than your
5 kx cost of physically performing source distribution, a complete
5 kx machine-readable copy of the corresponding source code, to be
5 kx distributed under the terms of Sections 1 and 2 above on a medium
5 kx customarily used for software interchange; or,
5 kx
5 kx c) Accompany it with the information you received as to the offer
5 kx to distribute corresponding source code. (This alternative is
5 kx allowed only for noncommercial distribution and only if you
5 kx received the program in object code or executable form with such
5 kx an offer, in accord with Subsection b above.)
5 kx
5 kx The source code for a work means the preferred form of the work for
5 kx making modifications to it. For an executable work, complete source
5 kx code means all the source code for all modules it contains, plus any
5 kx associated interface definition files, plus the scripts used to
5 kx control compilation and installation of the executable. However, as a
5 kx special exception, the source code distributed need not include
5 kx anything that is normally distributed (in either source or binary
5 kx form) with the major components (compiler, kernel, and so on) of the
5 kx operating system on which the executable runs, unless that component
5 kx itself accompanies the executable.
5 kx
5 kx If distribution of executable or object code is made by offering
5 kx access to copy from a designated place, then offering equivalent
5 kx access to copy the source code from the same place counts as
5 kx distribution of the source code, even though third parties are not
5 kx compelled to copy the source along with the object code.
5 kx
5 kx 4. You may not copy, modify, sublicense, or distribute the Program
5 kx except as expressly provided under this License. Any attempt
5 kx otherwise to copy, modify, sublicense or distribute the Program is
5 kx void, and will automatically terminate your rights under this License.
5 kx However, parties who have received copies, or rights, from you under
5 kx this License will not have their licenses terminated so long as such
5 kx parties remain in full compliance.
5 kx
5 kx 5. You are not required to accept this License, since you have not
5 kx signed it. However, nothing else grants you permission to modify or
5 kx distribute the Program or its derivative works. These actions are
5 kx prohibited by law if you do not accept this License. Therefore, by
5 kx modifying or distributing the Program (or any work based on the
5 kx Program), you indicate your acceptance of this License to do so, and
5 kx all its terms and conditions for copying, distributing or modifying
5 kx the Program or works based on it.
5 kx
5 kx 6. Each time you redistribute the Program (or any work based on the
5 kx Program), the recipient automatically receives a license from the
5 kx original licensor to copy, distribute or modify the Program subject to
5 kx these terms and conditions. You may not impose any further
5 kx restrictions on the recipients' exercise of the rights granted herein.
5 kx You are not responsible for enforcing compliance by third parties to
5 kx this License.
5 kx
5 kx 7. If, as a consequence of a court judgment or allegation of patent
5 kx infringement or for any other reason (not limited to patent issues),
5 kx conditions are imposed on you (whether by court order, agreement or
5 kx otherwise) that contradict the conditions of this License, they do not
5 kx excuse you from the conditions of this License. If you cannot
5 kx distribute so as to satisfy simultaneously your obligations under this
5 kx License and any other pertinent obligations, then as a consequence you
5 kx may not distribute the Program at all. For example, if a patent
5 kx license would not permit royalty-free redistribution of the Program by
5 kx all those who receive copies directly or indirectly through you, then
5 kx the only way you could satisfy both it and this License would be to
5 kx refrain entirely from distribution of the Program.
5 kx
5 kx If any portion of this section is held invalid or unenforceable under
5 kx any particular circumstance, the balance of the section is intended to
5 kx apply and the section as a whole is intended to apply in other
5 kx circumstances.
5 kx
5 kx It is not the purpose of this section to induce you to infringe any
5 kx patents or other property right claims or to contest validity of any
5 kx such claims; this section has the sole purpose of protecting the
5 kx integrity of the free software distribution system, which is
5 kx implemented by public license practices. Many people have made
5 kx generous contributions to the wide range of software distributed
5 kx through that system in reliance on consistent application of that
5 kx system; it is up to the author/donor to decide if he or she is willing
5 kx to distribute software through any other system and a licensee cannot
5 kx impose that choice.
5 kx
5 kx This section is intended to make thoroughly clear what is believed to
5 kx be a consequence of the rest of this License.
5 kx
5 kx 8. If the distribution and/or use of the Program is restricted in
5 kx certain countries either by patents or by copyrighted interfaces, the
5 kx original copyright holder who places the Program under this License
5 kx may add an explicit geographical distribution limitation excluding
5 kx those countries, so that distribution is permitted only in or among
5 kx countries not thus excluded. In such case, this License incorporates
5 kx the limitation as if written in the body of this License.
5 kx
5 kx 9. The Free Software Foundation may publish revised and/or new versions
5 kx of the General Public License from time to time. Such new versions will
5 kx be similar in spirit to the present version, but may differ in detail to
5 kx address new problems or concerns.
5 kx
5 kx Each version is given a distinguishing version number. If the Program
5 kx specifies a version number of this License which applies to it and "any
5 kx later version", you have the option of following the terms and conditions
5 kx either of that version or of any later version published by the Free
5 kx Software Foundation. If the Program does not specify a version number of
5 kx this License, you may choose any version ever published by the Free Software
5 kx Foundation.
5 kx
5 kx 10. If you wish to incorporate parts of the Program into other free
5 kx programs whose distribution conditions are different, write to the author
5 kx to ask for permission. For software which is copyrighted by the Free
5 kx Software Foundation, write to the Free Software Foundation; we sometimes
5 kx make exceptions for this. Our decision will be guided by the two goals
5 kx of preserving the free status of all derivatives of our free software and
5 kx of promoting the sharing and reuse of software generally.
5 kx
5 kx NO WARRANTY
5 kx
5 kx 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
5 kx FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
5 kx OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
5 kx PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
5 kx OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
5 kx MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
5 kx TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
5 kx PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
5 kx REPAIR OR CORRECTION.
5 kx
5 kx 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
5 kx WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
5 kx REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
5 kx INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
5 kx OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
5 kx TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
5 kx YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
5 kx PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
5 kx POSSIBILITY OF SUCH DAMAGES.
5 kx
5 kx END OF TERMS AND CONDITIONS
5 kx
5 kx How to Apply These Terms to Your New Programs
5 kx
5 kx If you develop a new program, and you want it to be of the greatest
5 kx possible use to the public, the best way to achieve this is to make it
5 kx free software which everyone can redistribute and change under these terms.
5 kx
5 kx To do so, attach the following notices to the program. It is safest
5 kx to attach them to the start of each source file to most effectively
5 kx convey the exclusion of warranty; and each file should have at least
5 kx the "copyright" line and a pointer to where the full notice is found.
5 kx
5 kx <one line to give the program's name and a brief idea of what it does.>
5 kx Copyright (C) <year> <name of author>
5 kx
5 kx This program is free software; you can redistribute it and/or modify
5 kx it under the terms of the GNU General Public License as published by
5 kx the Free Software Foundation; either version 2 of the License, or
5 kx (at your option) any later version.
5 kx
5 kx This program is distributed in the hope that it will be useful,
5 kx but WITHOUT ANY WARRANTY; without even the implied warranty of
5 kx MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
5 kx GNU General Public License for more details.
5 kx
5 kx You should have received a copy of the GNU General Public License
5 kx along with this program; if not, write to the Free Software
5 kx Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
5 kx
5 kx
5 kx Also add information on how to contact you by electronic and paper mail.
5 kx
5 kx If the program is interactive, make it output a short notice like this
5 kx when it starts in an interactive mode:
5 kx
5 kx Gnomovision version 69, Copyright (C) year name of author
5 kx Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
5 kx This is free software, and you are welcome to redistribute it
5 kx under certain conditions; type `show c' for details.
5 kx
5 kx The hypothetical commands `show w' and `show c' should show the appropriate
5 kx parts of the General Public License. Of course, the commands you use may
5 kx be called something other than `show w' and `show c'; they could even be
5 kx mouse-clicks or menu items--whatever suits your program.
5 kx
5 kx You should also get your employer (if you work as a programmer) or your
5 kx school, if any, to sign a "copyright disclaimer" for the program, if
5 kx necessary. Here is a sample; alter the names:
5 kx
5 kx Yoyodyne, Inc., hereby disclaims all copyright interest in the program
5 kx `Gnomovision' (which makes passes at compilers) written by James Hacker.
5 kx
5 kx <signature of Ty Coon>, 1 April 1989
5 kx Ty Coon, President of Vice
5 kx
5 kx This General Public License does not permit incorporating your program into
5 kx proprietary programs. If your program is a subroutine library, you may
5 kx consider it more useful to permit linking proprietary applications with the
5 kx library. If this is what you want to do, use the GNU Library General
5 kx Public License instead of this License.