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original authors' reputations.
Finally, any free program is threatened
constantly by software patents. We wish
to avoid the danger that redistributors of a
free program will individually obtain patent
licenses, in effect making the program
proprietary. To prevent this, we have made
it clear that any patent must be licensed for
everyone's free use or not licensed at all.
The precise terms and conditions for copy-
ing, distribution and modification follow.
TeRmS anD ConDiTionS FoR
Copying, DiSTRiBuTion anD
moDiFiCaTion
Version 2, June 1991 Copyright (C) 1989,
1991 Free Software Foundation, Inc. 51
Franklin S
0. This License applies to any program
or other work which contains a notice
placed by the copyright holder saying it
may be distributed under the terms of
this General Public License.
The "Program", below, refers to any such
program or work, and a "work based on
the Program" means either the Program
or any derivative work under copyright
law : that is to say, a work containing the
Program or a portion of it, either verbatim
or with modifications and/or translated
into another language. (Hereinafter,
translation is included without limitation
in the term "modification".) Each licensee
is addressed as "you".
Activities other than copying, distribu-
tion and modification are not covered
by this License ; they are outside its
scope. The act of running the Program
is not restricted, and the output from the
Program is covered only if its contents
constitute a work based on the Program
(independent of having been made by
running the Program). Whether that is
true depends on what the Program does.
1. You may copy and distribute verbatim
copies of the Program's source code as
you receive it, in any medium, provided
that you conspicuously and appropriately
publish on each copy an appropriate
copyright notice and disclaimer of war-
ranty; keep intact all the notices that refer
to this License and to the absence of any
warranty ; and give any other recipients
of the Program a copy of this License
along with the Program.
You may charge a fee for the physical
act of transferring a copy, and you may
at your option offer warranty protection
in exchange for a fee.
2. You may modify your copy or copies of
the Program or any portion of it, thus
forming a work based on the Program,
and copy and distribute such modifica-
tions or work under the terms of Section
1 above, provided that you also meet all
of these conditions :
a) You must cause the modified files to
carry prominent notices stating that
you changed the files and the date of
any change.
b) You must cause any work that you
distribute or publish, that in whole or
in part contains or is derived from the
Program or any part thereof, to be
licensed as a whole at no charge to
all third parties under the terms of this
License.
c) If the modified program normally reads
commands interactively when run,you
must cause it, when started running
for such interactive use in the most
ordinary way, to print or display an
announcement including an appropri-
ate copyright notice and a notice that
there is no warranty (or else, saying
that you provide a warranty) and that
users may redistribute the program
under these conditions, and telling
the user how to view a copy of this Li-
cense. (Exception:if the Program itself
is interactive but does not normally
print such an announcement, your
work based on the Program is not
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