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GNU
GENERAL
PUBLIC
LICENSE
Version
2,
June
1991
29
Copyright
(C)
1989,
1991
Free
Software
Foundation,
Inc.
675
Mass
Ave,
Cambridge,
MA
02139,
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
guar-
antee
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 Foundation's software
and
to
any
other
program
whose
authors commit to
using
it.
(Some
other
Free
Software
Foundation
software
is
covered
by
the
GNU
library
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
dis-
tribute 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
with
two steps:
(1)
copyright
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
software.
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 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 copying, distribution
and
modification
follow.
GNU
GENERAL
PUBLIC
LICENSE
TERMS
AND
CONDITIONS
FOR
COPYING,
DISTRIBUTION
AND
MODIFICATION
O.
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
deriva-
tive
work
under
copyright
law:
that
is
to
say,
awork 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, distribution
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
warranty;
keep
intact
all
the
notices that
refer
to
this license
and
to
the
absence
of
any
war-
ranty;
and
give
any
other recipients of the
Program
acopy 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 awork
based
on
the
Program,
and
copy
and
distribute
such
modifications
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
appropriate 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
acopy
of
this license.
(Exception:
if
the
Program
itself
is
interactive but
does
not normally print
such
an
announcement, your
work
based
on
the
Program
is
not
required
to
print
an
announcement.)
These
requirements
apply
to
the
modified work
as
a
whole.
If identifiable sections of that work
are
not
derived
from
the
Program,
and
can
be
reasonably considered
independent
and
separate
works
in
themselves,
then
this
License,
and
its terms,
do
not
apply to
those
sections
when
you
distribute
them
as
separate
works.
But
when
you
distribute
the
same
sections
as
part of a
whole
which
is
a
work
based
on
the
Program,
the
distribution
of
the
whole
must
be
on
the
terms of this
License,
whose
permissions
for
other licensees
extend
to
the
entire
whole,
and
thus
to
each
and
every
part regardless of
who
wrote
it.
Thus,
it
is
not
the
intent
of
this section
to
claim
rights
or
contest
your
rights
to
work written entirely
by
you;
rather,
the
intent
is
to
exercise
the
right
to
control
the
distribution
of
derivative
or
collective works
based
on
the
Program.
In
addition,
mere
aggregation
of
another
work
not
based
on
the
Program
with
the
Program
(or
with
a
work
based
on
the
Program)
on
a
volume
of
a
storage
or
distri-
bution
medium
does
not
bring
the
other
work
under
the
scope
of
this
License.
3.
You
may
copy
and
distribute
the
Program
(or
a
work
based
on
it,
under Section
2)
in
object code
or
executable
form
under
the
terms
of Sections 1
and
2
above
provided that
you
also
do
one
of
the
following:
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