The GNU General Public License (GPL) Version 2, June 1991
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Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Everyone is permitted to copy and distribute verbatim copies of this license
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document, but changing it is not allowed.
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Preamble
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The licenses for most software are designed to take away your freedom to share
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and change it. By contrast, the GNU General Public License is intended to
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guarantee your freedom to share and change free software--to make sure the
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software is free for all its users. This General Public License applies to most
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of the Free Software Foundation's software and to any other program whose
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authors commit to using it. (Some other Free Software Foundation software is
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covered by the GNU Library General Public License instead.) You can apply it to
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your programs, too. When we speak of free software, we are referring to freedom,
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not price. Our General Public Licenses are designed to make sure that you have
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the freedom to distribute copies of free software (and charge for this service
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if you wish), that you receive source code or can get it if you want it, that
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you can change the software or use pieces of it in new free programs; and that
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you know you can do these things. To protect your rights, we need to make
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restrictions that forbid anyone to deny you these rights or to ask you to
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surrender the rights. These restrictions translate to certain responsibilities
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for you if you distribute copies of the software, or if you modify it.
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For example, if you distribute copies of such a program, whether gratis or for a
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fee, you must give the recipients all the rights that you have. You must make
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sure that they, too, receive or can get the source code. And you must show them
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these terms so they know their rights.
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We protect your rights with two steps: (1) copyright the software, and (2) offer
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you this license which gives you legal permission to copy, distribute and/or
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modify the software.
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Also, for each author's protection and ours, we want to make certain that
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everyone understands that there is no warranty for this free software. If the
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software is modified by someone else and passed on, we want its recipients to
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know that what they have is not the original, so that any problems introduced by
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others will not reflect on the original authors' reputations.
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Finally, any free program is threatened constantly by software patents. We wish
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to avoid the danger that redistributors of a free program will individually
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obtain patent licenses, in effect making the program proprietary. To prevent
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this, we have made it clear that any patent must be licensed for everyone's free
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use or not licensed at all.
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The precise terms and conditions for copying, distribution and modification
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follow. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This
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License applies to any program or other work which contains a notice placed by
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the copyright holder saying it may be distributed under the terms of this
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General Public License. The "Program", below, refers to any such program or
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work, and a "work based on the Program" means either the Program or any
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derivative work under copyright law: that is to say, a work containing the
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Program or a portion of it, either verbatim or with modifications and/or
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translated into another language. (Hereinafter, translation is included without
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limitation in the term "modification".) Each licensee is addressed as "you".
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Activities other than copying, distribution and modification are not covered by
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this License; they are outside its scope. The act of running the Program is not
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restricted, and the output from the Program is covered only if its contents
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constitute a work based on the Program (independent of having been made by
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running the Program). Whether that is true depends on what the Program does.
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1. You may copy and distribute verbatim copies of the Program's source code as
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you receive it, in any medium, provided that you conspicuously and appropriately
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publish on each copy an appropriate copyright notice and disclaimer of warranty;
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keep intact all the notices that refer to this License and to the absence of any
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warranty; and give any other recipients of the Program a copy of this License
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along with the Program.
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You may charge a fee for the physical act of transferring a copy, and you may at
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your option offer warranty protection in exchange for a fee.
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2. You may modify your copy or copies of the Program or any portion of it, thus
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forming a work based on the Program, and copy and distribute such modifications
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or work under the terms of Section 1 above, provided that you also meet all of
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these conditions:
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a) You must cause the modified files to carry prominent notices stating that you
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changed the files and the date of any change.
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b) You must cause any work that you distribute or publish, that in whole or in
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part contains or is derived from the Program or any part thereof, to be licensed
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as a whole at no charge to all third parties under the terms of this License.
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c) If the modified program normally reads commands interactively when run, you
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must cause it, when started running for such interactive use in the most
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ordinary way, to print or display an announcement including an appropriate
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copyright notice and a notice that there is no warranty (or else, saying that
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you provide a warranty) and that users may redistribute the program under these
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conditions, and telling the user how to view a copy of this License. (Exception:
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if the Program itself is interactive but does not normally print such an
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announcement, your work based on the Program is not required to print an
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announcement.)
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These requirements apply to the modified work as a whole. If identifiable
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sections of that work are not derived from the Program, and can be reasonably
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considered independent and separate works in themselves, then this License, and
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its terms, do not apply to those sections when you distribute them as separate
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works. But when you distribute the same sections as part of a whole which is a
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work based on the Program, the distribution of the whole must be on the terms of
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this License, whose permissions for other licensees extend to the entire whole,
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and thus to each and every part regardless of who wrote it.
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Thus, it is not the intent of this section to claim rights or contest your
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rights to work written entirely by you; rather, the intent is to exercise the
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right to control the distribution of derivative or collective works based on the
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Program. In addition, mere aggregation of another work not based on the Program
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with the Program (or with a work based on the Program) on a volume of a storage
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or distribution medium does not bring the other work under the scope of this
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License.
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3. You may copy and distribute the Program (or a work based on it, under Section
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2) in object code or executable form under the terms of Sections 1 and 2 above
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provided that you also do one of the following:
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a) Accompany it with the complete corresponding machine-readable source code,
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which must be distributed under the terms of Sections 1 and 2 above on a medium
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customarily used for software interchange; or,
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b) Accompany it with a written offer, valid for at least three years, to give
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any third party, for a charge no more than your cost of physically performing
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source distribution, a complete machine-readable copy of the corresponding
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source code, to be distributed under the terms of Sections 1 and 2 above on a
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medium customarily used for software interchange; or,
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c) Accompany it with the information you received as to the offer to distribute
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corresponding source code. (This alternative is allowed only for noncommercial
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distribution and only if you received the program in object code or executable
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form with such an offer, in accord with Subsection b above.)
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The source code for a work means the preferred form of the work for making
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modifications to it. For an executable work, complete source code means all the
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source code for all modules it contains, plus any associated interface
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definition files, plus the scripts used to control compilation and installation
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of the executable. However, as a special exception, the source code distributed
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need not include anything that is normally distributed (in either source or
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binary form) with the major components (compiler, kernel, and so on) of the
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operating system on which the executable runs, unless that component itself
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accompanies the executable. If distribution of executable or object code is made
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by offering access to copy from a designated place, then offering equivalent
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access to copy the source code from the same place counts as distribution of the
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source code, even though third parties are not compelled to copy the source
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along with the object code.
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4. You may not copy, modify, sublicense, or distribute the Program except as
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expressly provided under this License. Any attempt otherwise to copy, modify,
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sublicense or distribute the Program is void, and will automatically terminate
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your rights under this License. However, parties who have received copies, or
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rights, from you under this License will not have their licenses terminated so
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long as such parties remain in full compliance.
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5. You are not required to accept this License, since you have not signed it.
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However, nothing else grants you permission to modify or distribute the Program
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or its derivative works. These actions are prohibited by law if you do not
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accept this License. Therefore, by modifying or distributing the Program (or any
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work based on the Program), you indicate your acceptance of this License to do
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so, and all its terms and conditions for copying, distributing or modifying the
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Program or works based on it.
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6. Each time you redistribute the Program (or any work based on the Program),
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the recipient automatically receives a license from the original licensor to
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copy, distribute or modify the Program subject to these terms and conditions.
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You may not impose any further restrictions on the recipients' exercise of the
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rights granted herein. You are not responsible for enforcing compliance by third
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parties to this License.
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7. If, as a consequence of a court judgment or allegation of patent infringement
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or for any other reason (not limited to patent issues), conditions are imposed
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on you (whether by court order, agreement or otherwise) that contradict the
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conditions of this License, they do not excuse you from the conditions of this
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License. If you cannot distribute so as to satisfy simultaneously your
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obligations under this License and any other pertinent obligations, then as a
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consequence you may not distribute the Program at all. For example, if a patent
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license would not permit royalty-free redistribution of the Program by all those
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who receive copies directly or indirectly through you, then the only way you
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could satisfy both it and this License would be to refrain entirely from
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distribution of the Program.
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If any portion of this section is held invalid or unenforceable under any
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particular circumstance, the balance of the section is intended to apply and the
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section as a whole is intended to apply in other circumstances. It is not the
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purpose of this section to induce you to infringe any patents or other property
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right claims or to contest validity of any such claims; this section has the
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sole purpose of protecting the integrity of the free software distribution
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system, which is implemented by public license practices. Many people have made
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generous contributions to the wide range of software distributed through that
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system in reliance on consistent application of that system; it is up to the
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author/donor to decide if he or she is willing to distribute software through
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any other system and a licensee cannot impose that choice.
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This section is intended to make thoroughly clear what is believed to be
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consequence of the rest of this License.
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8. If the distribution and/or use of the Program is restricted in certain
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countries either by patents or by copyrighted interfaces, the original copyright
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holder who places the Program under this License may add an explicit
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geographical distribution limitation excluding those countries, so that
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distribution is permitted only in or among countries not thus excluded. In such
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case, this License incorporates the limitation as if written in the body of this
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License.
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9. The Free Software Foundation may publish revised and/or new versions of the
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General Public License from time to time. Such new versions will be similar in
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spirit to the present version, but may differ in detail to address new problems
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or concerns.
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Each version is given a distinguishing version number. If the Program specifies
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a version number of this License which applies to it and "any later version",
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you have the option of following the terms and conditions either of that version
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or of any later version published by the Free Software Foundation. If the
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Program does not specify a version number of this License, you may choose any
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version ever published by the Free Software Foundation.
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10. If you wish to incorporate parts of the Program into other free programs
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whose distribution conditions are different, write to the author to ask for
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permission. For software which is copyrighted by the Free Software Foundation,
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write to the Free Software Foundation; we sometimes make exceptions for this.
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Our decision will be guided by the two goals of preserving the free status of
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all derivatives of our free software and of promoting the sharing and reuse of
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software generally.
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NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
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WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
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OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE
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THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
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PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU
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ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL
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ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE
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PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
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SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY
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TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
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THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
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PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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END OF TERMS AND CONDITIONS
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How to Apply These Terms to Your New Programs
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If you develop a new program, and you want it to be of the greatest possible use
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to the public, the best way to achieve this is to make it free software which
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everyone can redistribute and change under these terms.
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To do so, attach the following notices to the program. It is safest to attach
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them to the start of each source file to most effectively convey the exclusion
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of warranty; and each file should have at least the "copyright" line and a
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pointer to where the full notice is found.
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One line to give the program's name and a brief idea of what it does.
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Copyright (C) <year> <name of author> This program is free software; you can
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redistribute it and/or modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. This program is distributed in
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the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details. You should have received a copy of
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the GNU General Public License along with this program; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA
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Also add information on how to contact you by electronic and paper mail. If the
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program is interactive, make it output a short notice like this when it starts
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in an interactive mode:
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Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with
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ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and
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you are welcome to redistribute it under certain conditions; type `show c' for
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details. The hypothetical commands `show w' and `show c' should show the
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appropriate parts of the General Public License. Of course, the commands you use
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may be called something other than `show w' and `show c'; they could even be
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mouse-clicks or menu items--whatever suits your program.
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You should also get your employer (if you work as a programmer) or your school,
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if any, to sign a "copyright disclaimer" for the program, if necessary. Here is
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a sample; alter the names:
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
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`Gnomovision' (which makes passes at compilers) written by James Hacker.
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signature of Ty Coon, 1 April 1989 Ty Coon, President of Vice This General
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Public License does not permit incorporating your program into proprietary
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programs. If your program is a subroutine library, you may consider it more
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useful to permit linking proprietary applications with the library. If this is
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what you want to do, use the GNU Library General Public License instead of this
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License.
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"CLASSPATH" EXCEPTION TO THE GPL VERSION 2
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Certain source files distributed by Sun Microsystems, Inc. are subject to the
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following clarification and special exception to the GPL Version 2, but only
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where Sun has expressly included in the particular source file's header the
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words "Sun designates this particular file as subject to the "Classpath"
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exception as provided by Sun in the License file that accompanied this code."
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Linking this library statically or dynamically with other modules is making a
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combined work based on this library. Thus, the terms and conditions of the GNU
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General Public License Version 2 cover the whole combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the terms and
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conditions of the license of that module. An independent module is a module
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which is not derived from or based on this library. If you modify this library,
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you may extend this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this exception statement
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from your version.
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