GNU
GENERAL
PUBLIC
LICENSE
Version 2, June
1991
Copyright
(C)
1989,
1991
Free
Software Foundation,
Inc.,
51
Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
Everyone
is
permitted
to
copy and distribute verbatim copies
of
this
license document,
but
changing
it
is
not
allowed.
Preamble
The licenses
for
most
software
are
designed
to
take
away
your
freedom
to
share and change it.
By
contrast, the
GNU
General
Public
License
is
intended
to
guarantee your freedom
to
share and change
free software--to make sure
the
software
is
free for
all its users. This
General
Public License applies
to
most
of
the
Free
Software Founda-
tion's software and
to
any other program whose authors
commit
to
using it. (Some other
Free
Software Foundation software
is
covered
by the
GNU
Lesser
General Public
License instead.)
You
can
apply
it
to
your programs, too.
When we speak
of
free software, we are referring
to
freedom,
not
price.
Our
General
Public Licenses are designed
to
make sure that you
have
the
freedom
to
distribute copies
of
free software (and charge
for this service
if
you wish),
that
you receive source code
or
can
get
it
if
you want it,
that
you
can
change the software or
use
pieces
of
it
in
new free programs; and
that
you know you can
do
these things.
To
protect
your
rights, we need
to
make restrictions
that
forbid
anyone
to
deny you these rights or
to
ask
you
to
surrender the rights.
These restrictions translate
to
certain responsibilities for you
if
you
distribute copies
of
the software,
or
if
you modify it.
For example,
if
you
distribute
copies
of
such a program,
whether
gratis
or
for a
fee,
you must give the recipients
all the rights that you
have.
You
must make sure
that
they, too, receive
or
can
get
the source
code. And you must show them these terms
so
they know their rights.
We
protect your rights wi
th
two
steps: (1) copyri
ght
the
software, and
(2)
offer you this license which gives you legal permission
to
copy,
distribute and/or modify the software.
Also,
for each author's protection and ours, we want
to
make certain
that everyone understands that there is no warranty for this free soft-
ware.
If
the software
is
modified by someone else and passed on, we
want its recipients
to
know
that
what
they
have
is
not
the original,
so
that any problems introduced by others
will
not
reflect on the original
authors' reputations.
Finally, any free
program
is
threatened
constant
ly
by
softwa
re
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
al
l.
The
precise terms and conditions
fo
r copying, distribution and
mod
i-
fication
follow.
GNU
GENERAL
PUBLIC
LICENSE
TERMS
AND
CONDITIONS
FOR
COPYING,
DISTRIBUTION
AND MOD-
IFICATION
0.
This
License applies
to
any program
or
other work which contai
ns
a notice placed by the copyright holder saying
it
may be distrib-
uted under the terms
of
this General Public
License.
The
"Program
':
below, refers
to
any such program
or
wo
rk, and a
"
wo
rk
based
on
the
Program"
means
either
the
Progr
am
or
any
de
rivative
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
"
modi
fication"
.)
Each
licensee
is
addressed
as
"you':
Activities
other
than
copying, distribution and modification are
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