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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 dis tribute verbatim copies of this lic ense document, but changin g it is not allowed.
Preamble
The licenses for most softwar e are designed to take away your freedom to s hare and change it. By contras t, the GNU General Public Lice nse is intended to
guarantee your freedom to share and c hange free software- -to make sure the software is free for a ll its users. This Genera l Public License applies to most o f the
Free Software Foundation’s software a nd to any other program whose autho rs commit to using it. (Some other Fre e Software Foundation soft ware is covered by
the GNU Library General Publi c License instead.) You can apply it to your prog rams, too.
When we speak of free software, we are r eferring to freedom, not pric e. Our General Public Licens es are designed to make sure that you have th e freedom to dis-
tribute copies of free software (a nd charge for this service if yo u wish), that you receive source code or ca n get it if you want it, that you can change t he software
or use pieces of it in new free progra ms; and that you know you can do these thing s.
To protect your rights, we need to make restrictio ns that forbid anyone to deny you these rig hts or to ask you to surrender the righ ts. These restrictions tra nslate
to certain responsibilities f or you if you distribute copies of the sof tware, or if you modify it.
For example, if you distribute copies of suc h a program, whether gratis or fo r a fee, you must give the recipients all th e rights that you have. You must make sure
that they, too, receive or can get the source code. A nd you must show them these terms so th ey know their rights.
We protect your rights with two steps: (1) copyright the s oftware, and (2) offer you this lic ense which gives you legal perm ission to copy, distribute and/or modif y
the software.
Also, for each author’s protection and our s, we want to make certain that ever yone understands that the re is no warranty for this free sof tware. If the software is
modified by someone else and pas sed on, we want its recipients to know th at what they have is not the original, so that a ny problems introduced by other s will
not reflect on the original author s’ reputations.
Finally, any free program is threatened co nstantly by software patent s. We wish to avoid the danger that redistri butors of a free program will indi vidually obtain
patent licenses, in effect mak ing the program proprietar y. To prevent this, we have made it clear that any patent mus t be licensed for everyone’s free use o r not
licensed at all.
The precise terms and condition s for copying, distribution and modification follow.
GNU GENERAL PUBLIC LIC ENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any progra m or other work which contains a not ice placed by the copyright holde r saying it may be distributed unde r the terms of this
General Public License. The “Pr ogram”, below, refers to any such program or work , and a “work based on the Program” m eans either the Program or any de riva-
tive work under copyright law: that is to say, a work conta ining the Program or a portio n of it, either verbatim or with modif ications and/or translated in to another
language. (Hereinafter, translati on is included without limitat ion in the term “modification”.) Each licens ee is addressed as “you”.
Activities other than copying, distr ibution and modification ar e not covered by this License; they are ou tside its scope. The act of runni ng the Program is not
restricted, and the output from the Pr ogram is covered only if its conten ts constitute a work based on the Pro gram (independent of having be en made by running
the Program). Whether that is true depe nds on what the Program does.
1. You may copy and distribute verbatim copies of the Progra m’s source code as you receive it, in any medi um, provided that you conspicuou sly and appropri-
ately publish on each copy an appropr iate copyright notice and discla imer of warranty; keep intac t all the notices that refer to this Lice nse and to the absence of
any warranty; and give any other recip ients of the Program a copy of this Lice nse along with the Program.
You may charge a fee for the physical act of transfe rring a copy, and you may at your option offer war ranty protection in exchange fo r a fee.
2. You may modify your copy or copies of the Program or a ny portion of it, thus forming a wor k based on the Program, and copy an d distribute such modifica-
tions or work under the terms of Sectio n 1 above, provided that you also meet all o f these conditions:
a) You must cause the modified files to carr y prominent notices stating t hat you changed the files and the da te of any change.
b) You must cause any work that you distribute or publis h, that in whole or in part contai ns or is derived from the Program or a ny part thereof, to be licensed
as a whole at no charge to all third parti es under the terms of this Licens e.
c) If the modified program normall y reads commands interactivel y when run, you must cause it, when s tarted running for such inte ractive use in the
most ordinary way, to print or display an anno uncement including an appro priate copyright notice and a noti ce that there is no warranty (or els e, saying
that you provide a warranty) and that us ers may redistribute the progr am under these conditions, a nd telling the user how to view a copy of this Lic ense.
(Exception: if the Program itself is inte ractive but does not normally p rint such an announcement, yo ur work based on the Program is not re quired to print
an announcement.)
These requirements apply to the mo dified work as a whole. If identif iable sections of that work are no t derived from the Program, and ca n be reasonably consid-
ered independent and separa te works in themselves, then this Lic ense, and its terms, do not apply to th ose sections when you distrib ute them as separate works.
But when you distribute the same sect ions as part of a whole which is a wor k based on the Program, the distri bution of the whole must be on the term s of this
License, whose permissions f or other licensees extend to the e ntire whole, and thus to each and ever y part regardless of who w rote it.
Thus, it is not the intent of this section to cl aim rights or contest your rights to wo rk written entirely by you; rather, the inten t is to exercise the right to control the
distribution of derivative or collec tive works based on the Program.
In addition, mere aggregation of anot her work not based on the Program w ith the Program (or with a work based on t he Program) on a volume of a storage or
distribution medium does not brin g the other work under the scope of thi s License.
3. You may copy and distribute the Program (or a work base d on it, under Section 2) in object c ode or executable form under the te rms of Sections 1 and 2 above
provided that you also do one of the following:
a) Accompany it with the complete corre sponding machine-read able source code, which must be d istributed under the terms of Se ctions 1 and 2 above on
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