GNU
GENERAL
PUBLIC
LICENSE
Version 3,
29
June
2007
Copyright
(C)
2007
Free
Software Foundation, Inc.
<http://fsf.org/>
Everyone
is
permitted
to
copy and distribute verbatim copies
of
this license document,
but
changing
it
is
not
allowed.
Preamble
The
GNU
General
Public
License
is
a free, copyleft license
for
software
and
other
kinds
of
works.
The licenses for
most
software and
other
practical works are designed
to
take away
your
freedom
to
share and change
the
works.
By
con-
trast,
the
GNU
General
Public
License
is
intended
to
guarantee
your
freedom
to
share and change
all
versions
of
a program--to make sure
it
remains free software
for
all
its users.
We,
the
Free Software Foun-
dation, use
the
GNU
General
Public
License
for
most
of
our
software;
it
applies also
to
any
other
work
released this way
by
its authors.
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
them
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
prevent others
from
denying
you
these
rights
or
asking
you
to
surrender
the
rights. Therefore,
you
have certain responsibilities
if
you
distribute
copies
of
the
software,
or
if
you
modify
it: responsibilities
to
respect
the
freedom
of
others.
For example,
if
you distribute copies
of
such a program,
whether
gra-
tis
or
for
a fee, you
must
pass
on
to
the
recipients
the
same freedoms
that
you received.
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.
Developers
that
use
the
GNU
GPL
protect
your
rights
with
two
steps:
(1)
assert
copyright
on
the
software, and (2)
offer
you
this
License
giving you legal permission
to
copy,
distribute
and/or
modify
it.
For
the
developers' and authors' protection,
the
GPL
clearly
explains
that
there
is
no
warranty
for
this free software. For
both
users' and
authors'
sake,
the
GPL
requires
that
modified
versions be marked
as
changed,
so
that
the
ir problems
will
not
be
attributed
erroneously
to
authors
of
previous versions.
Some devices are
designed
to
deny
users access
to
install
or
run
modified versions
of
the
software inside
them
,
although
the
manu-
facturer can
do
so.
This
is
fundamentally
incompatible
with
the
aim
of
protecting users' freedom
to
change
the
software. The systematic
pattern
of
such abuse occurs in
the
area
of
products
for
individuals
to
use,
which
is
precisely
where
it
is
most
unacceptable. Therefore,
we have designed this version
of
the
GPL
to
prohibit
the
practice
for
those products.
If
such problems arise
substantially
in
other
domains,
we stand ready
to
extend
this provision
to
those
domains
in
future
versions
of
the
GPL,
as
needed
to
protect
the
freedom
of
users.
Finally,
every program
is
threatened constantly
by
software patents.
States should
not
allow
patents
to
restrict
development
and
use
of
software
on
general-purpose
computers,
but
in
those
that
do
,
we
wish
to
avoid
the
special
danger
that
patents applied
to
a free
pro-
gram could make
it
effectively proprietary.
To
prevent
this,
the
GPL
assures
that
patents cannot
be
used
to
render
the
program non-free.
The precise terms and conditions
for
copying,
distribution
and
modi-
fication follow.
TERMS
AND
CONDITIONS
0.
Definitions.
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