AAPPENDICESPPENDICES
A4 | GNU | GENERAL | PUBLIC | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION |
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| 0 This License applies to any program or other work which contains a notice placed by the copyright |
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| holder saying it may be distributed under the terms of this General Public License. The "Program", |
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| below, refers to any such program or work, and a "work based on the Program" means either the |
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| Version 2, June 1991, Copyright (C) 1989, 1991 | Program or any derivative work under copyright law: that is to say, a workcontaining the Program or a |
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| Free Software Foundation, Inc., 59 Temple Place - | portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, |
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| Suite 330, Boston, MA | translation is included without limitation in the term"modification".) Each licensee is addressed as |
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| "you". Activities other than copying, distribution and modification are not covered by this License; they |
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| Everyone is permitted to copy and distribute ver- | are outside its scope. The act of running the Program is not restricted, and the output from the Program |
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| batim copies of this license document, but chan- | is covered only if its contents constitute a work based on the Program (independent of having been |
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| ging it is not allowed. |
| made by running the Program). Whether that is true depends on what the Program does. |
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| Preamble |
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| 1 You may copy and distribute verbatim copies of the Program's source code as you receive it, in any |
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| The licenses for most software are designed to | medium, provided that you conspicuously and appropriately publish on each copy an appropriate copy- |
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| take away your freedom to share and change it. | right notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the |
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| By contrast, the GNU General Public License is | absence of any warranty; and give any other recipients of the Program a copy of this License along with |
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| intended to guarantee your freedom to share and | the Program. You may charge a fee for the physical act of transferring a copy, and you may at your opti- |
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| change free | on offer warranty protection in exchange for a fee. |
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| is free for all its users. This General Public License | 2 You may modify your copy or copies of the Program or any portion of it, thus forming a work based |
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| applies to most of the Free Software Foundation's |
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| software and to any other program whose aut- | on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, |
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| hors commit to using it. (Some other Free | provided that you also meet all of these conditions: |
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| Software Foundation software is covered by the | a) You must cause the modified files to carry prominent notices stating that you changed the files and |
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| GNU Library General Public License instead.) You | the date of any change. |
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| can apply it to your programs, too. |
| b) You must cause any work that you distribute or publish, that in whole or in part contains or is deri- |
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| ved from the Program or any part thereof, to be licensed as a whole at no charge to all third parties |
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| When we speak of free software, we are referring | under the terms of this License. |
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| to freedom, not price. Our General Public Licenses | c) If the modified program normally reads commands interactively when run, you must cause it,when |
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| are designed to make sure that you have the fre- | started running for such interactive use in the most ordinary way, to print or display an announcement |
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| edom to distribute copies of free software (and | including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you |
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| charge for this service if you wish), that you recei- | provide a warranty) and that users may redistribute the program under these conditions, and telling the |
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| ve source code or can get it if you want it, that | user how to view a copy of this License. (Exception: if the Program itself is interactive but does not nor- |
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| you can change the software or use pieces of it in | mally print such an announcement, your work based on the Program is not required to print an anno- |
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| new free programs; and that you know you can | uncement.) These requirements apply to the modified work as a whole. If identifiable sections of that |
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| do these things. |
| work are not derived from the Program, and can be reasonably considered independent and separate |
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| works in themselves, then this License, and its terms, do not apply to those sections when you distribu- |
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| To protect your rights, we need to make restric- | te them as separate works. But when you distribute the same sections as part of a whole which is a work |
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| tions that forbid anyone to deny you these rights | based on the Program, the distribution of the whole must be on the terms of this License, whose per- |
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| or to ask you to surrender the rights. These | missions for other licensees extend to the entire whole, and thus to each and every part regardless of |
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| restrictions translate to certain responsibilities for | who wrote it. |
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| you if you distribute copies of the software, or if | Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by |
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| you modify it. |
| you; rather, the intent is to exercise the right to control the distribution of derivative or collective works |
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| based on the Program. In addition, mere aggregation of another work not based on the Program with |
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| For example, if you distribute copies of such a | the Program (or with a work based on the Program) on a volume of a storage or distribution medium |
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| program, whether gratis or for a fee, you must | does not bring the other work under the scope of this License. |
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| give the recipients all the rights that you have. | 3 You may copy and distribute the Program (or a work based on it, under Section 2) in object code |
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| You must make sure that they, too, receive or can |
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| get the source code. And you must show them | or executable form under the terms of Sections 1 and 2 above provided that you also do one of the fol- |
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| these terms so they know their rights. | lowing: |
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| We protect your rights with two steps: | a) Accompany it with the complete corresponding |
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| (1) copyright the software, and |
| distributed under the terms of Sections 1 and 2 above on a medium customarily used for software |
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| (2) offer you this license which gives you legal | interchange; or, |
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| permission to copy, distribute and/or modify the | b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge |
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| software. |
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| no more than your cost of physically performing source distribution, a complete |
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| of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a |
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| Also, for each author's protection and ours, we | medium customarily used for software interchange; or, |
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| want to make certain that everyone understands | c) Accompany it with the information you received as to the offer to distribute corresponding source |
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| that there is no warranty for this free software. If | code. (This alternative is allowed only for noncommercial distribution and only if you received the pro- |
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| the software is modified by someone else and | gram in object code or executable form with such an offer, in accord with Subsection b above.) The sour- |
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| passed on, we want its recipients to know that | ce code for a work means the preferred form of the work for making modifications to it. For an exe- |
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| what they have is not the original, so that any | cutable work, complete source code means all the source code for all modules it contains, plus any asso- |
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| problems introduced by others will not reflect on | ciated interface definition files, plus the scripts used to control compilation and installation of the exe- |
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| the original authors' reputations. |
| cutable. However, as a special exception, the source code distributed need not include anything that is | 57 | |
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| normally distributed (in either source or binary form) with the major components (compiler, kernel, and | |
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| Finally, any free program is threatened constantly | so on) of the operating system on which the executable runs, unless that component itself accompanies |
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| by software patents. We wish to avoid the danger | the executable. If distribution of executable or object code is made by offering access to copy from a |
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| that redistributors of a free program will individu- | designated place, then offering equivalent access to copy the source code from the same place counts |
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| ally obtain patent licenses, in effect making the | as distribution of the source code, even though third parties are not compelled to copy the source along |
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| program proprietary. To prevent this, we have | with the object code. |
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| made it clear that any patent must be licensed for | 4 You may not copy, modify, sublicense, or distribute the |
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| everyone's free use or not licensed at all. The pre- |
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| cise terms and conditions for copying, distribution | Program except as expressly provided |
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| and modification follow. |
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