Trademark and License Information 53
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GNU General Public License
Version 2, June 1991
Copyright (C) 1989, 1991 Free Sof tware Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy a nd distribute verbatim copies o f this license document, but ch anging it is not allowed.
Preamble
The licenses for most sof tware are designed to take away your fre edom to share and change it. By co ntrast, the GNU General Publi c License is intended to
guarantee your freedom to sha re and change free softwa re--to make sure the software is f ree for all its users. This Ge neral Public License applie s to most of the
Free Software Foundation’s soft ware and to any other program whos e authors commit to using it. (Som e other Free Software Foundation s oftware is covered by
the GNU Library Gener al Public License instead.) You can apply it to you r programs, too.
When we speak of free softwa re, we are referring to freedom, no t price. Our General Public Li censes are designed to make sur e that you have the freedom to dis-
tribute copies of free sof tware (and charge for this ser vice if you wish), that you receive source c ode or can get it if you want it, that you can c hange the software
or use pieces of it in new free pro grams; and that you know you can do thes e things.
To protect your rights, we need to make restr ictions that forbid anyone to deny you the se rights or to ask you to surrender t he rights. These restricti ons translate
to certain responsibi lities for you if you distribute copie s of the software, or if you modif y it.
For example, if you distribute copi es of such a program, whether gra tis or for a fee, you must give the recipie nts all the rights that you have. You must make sure
that they, too, receive or can get the source c ode. And you must show them these ter ms so they know their rights.
We protect your rights with two step s: (1) copyright the software, and (2) offer you t his license which gives you legal p ermission to copy, distribute and/or mo dify
the software.
Also, for each author’s protectio n and ours, we want to make certain th at everyone understands th at there is no warranty for this f ree software. If the softwa re is
modified by someone else a nd passed on, we want its recipien ts to know that what they have is not the origina l, so that any problems introduce d by others will
not reflect on the original authors’ reputations.
Finally, any free program is threate ned constantly by softwar e patents. We wish to avoid the danger that red istributors of a free progra m will individually obtain
patent licenses, in effe ct making the program propri etary. To prevent this, we have made it clear that any pate nt must be licensed for everyo ne’s free use or not
licensed at all.
The precise terms and con ditions for copying, distributi on and modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any p rogram or other work which conta ins a notice placed by the copyrig ht holder saying it may be distribu ted under the terms of this
General Public License . The “Program”, below, refers to any such progra m or work, and a “work based on the Pro gram” means either the Progra m or any deriva-
tive work under copyright law: that i s to say, a work containing the Program or a por tion of it, either verbatim or wit h modifications and/or trans lated into another
language. (Hereinafter, translation is included without limitation in the term “modification”.) Each licensee is addressed as “you”.
Activities other than copyin g, distribution and modifica tion are not covered by this License; th ey are outside its scope. The act o f running the Program is not
restricted, and the output f rom the Program is covered only if it s contents constitute a work base d on the Program (independent o f having been made by running
the Program). Whether that is tru e depends on what the Program doe s.
1. You may copy and distribute verbatim copies of the P rogram’s source code as you receive it, in a ny medium, provided that you consp icuously and appropri-
ately publish on each copy an app ropriate copyright notice and d isclaimer of warranty; keep i ntact all the notices that refer to thi s License and to the absence of
any warranty; and give any other r ecipients of the Program a copy of thi s License along with the Progra m.
You may charge a fee for the physical act of tra nsferring a copy, and you may at your option of fer warranty protection in exch ange for a fee.
2. You may modify your copy or copies of the Prog ram or any portion of it, thus for ming a work based on the Program, an d copy and distribute such modifi ca-
tions or work under the terms of Se ction 1 above, provided that you also m eet all of these conditions:
a) You must cause the modified files to ca rry prominent notices s tating that you changed the files a nd the date of any change.
b) You must cause any work that you distribute or p ublish, that in whole or in part co ntains or is derived from the Prog ram or any part thereof, to be licen sed
as a whole at no charge to all third pa rties under the terms of this Li cense.
c) If the modified program nor mally reads commands intera ctively when run, you must cause i t, when started running for s uch interactive use in the
most ordinary way, to print or display a n announcement including an a ppropriate copyright notice a nd a notice that there is no warrant y (or else, saying
that you provide a warranty) an d that users may redistribute the p rogram under these condit ions, and telling the user how to view a copy of th is License.
(Exception: if the Program itse lf is interactive but does not nor mally print such an announce ment, your work based on the Progr am is not required to print
an announcement.)
These requirements app ly to the modified work as a whole. If id entifiable sections of that wor k are not derived from the Progra m, and can be reasonably cons id-
ered independent and se parate works in themselves, then t his License, and its terms, do not a pply to those sections when you di stribute them as separate works.
But when you distribute the same s ections as part of a whole whi ch is a work based on the Program, the d istribution of the whole must be o n the terms of this
License, whose permis sions for other licensees ex tend to the entire whole, and thus to each a nd every part regardle ss of who wrote it.
Thus, it is not the intent of this sec tion to claim rights or contest your r ights to work written entirely by you; r ather, the intent is to exercise the right to contro l the
distribution of derivative or c ollective works based on the Prog ram.
In addition, mere aggregati on of another work not based on the Pro gram with the Program (or with a work ba sed on the Program) on a volume of a storag e or
distribution medium does n ot bring the other work under the sc ope of this License.
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