Owner's Manual
provides
other
free
software
developers Less
of
an advantage over competing non-free programs. These disadvantages are
the
reason
we
use
the
ordinary
General Public License
for
many libraries. However.
the
Lesser license provides advantages in certain special circumstances.
For example, on rare occasions,
there
may be a special need
to
encourage
the
widest
possible use
of
a certain library, so
that
it
becomes a
de-facto
standard.
To
achieve this, non-free programs
must
be
allowed
to
use
the
library. A
more
frequent case is
that
a free library does
the
same
job
as widely used non-free
libraries. In
this
case,
there
is
little
to
gain by limiting
the
free library
to
free
software
only, so we use
the
Lesser General Public License.
In
other
cases, permission
to
use a particular library
in
non-free programs enables a greater number
of
people
to
use a large body
of
free software. For
example, permission
to
use
the
GNU C Library in non-free programs enables many more people
to
use
the
whole GNU operating system, as well as
its
variant,
the
GNU/Linux operating system.
Although
the
Lesser General Public License is Less protective
of
the
users' freedom,
it
does ensure
that
the
user
of
a program
that
is linked
with
the
Library
has
the
freedom and
the
wherewithal
to
run
that
program using
<1
modified version
of
the
Library.
The precise
terms
and conditions
for
copying, distribution and modification follow. Pay close
attention
to
the
difference between a
"work
based on
the
library" and a
"work
that
uses
the
library''.The
former
contains code derived
from
the
library, whereas
the
latter
must
be
combined
with
the
library in
order
to
run.
TERMS
AND
CONDITIONS
FOR
COPYING,
DISTRIBUTION
AND
MODIFICATION
0. This License Agreement applies
to
any
software
library
or
other
program which contains a notice placed by
the
copyright holder
or
other
authorized
party
saying
it
may be distributed under
the
terms
of
this
Lesser General Public License (also called
"this
License"). Each licensee is addressed as "you''.
A "library" means a collection
of
software
functions
and/or
data
prepared so
as
to
be conveniently linked
with
application programs (which use some
of
those
functions and
data)
to
form
executables.
The "Library'; below, refers
to
any such
software
library
or
work
which has been distributed under these terms. A
"work
based on
the
Library" means either·
the
Library
or
any derivative
work
under copyright law:
that
is
to
say,
a
work
containing
the
Library
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portion
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it,
either
verbatim
or
with
modifications
and/or
translated straightforwardly
into
another
language. (Hereinafter. translation is included
without
limitation
in
the
term
"modification~)
"Source code"
for
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work
means
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preferred
form
of
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work
for
making modifications
to
it. For a library, complete source code means all
the
source code
for
all modules
it
contains, plus any associated interface definition files, plus
the
scripts used
to
control compilation and installation
of
the
library.
Activities
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than
copying, distribution and modification are
not
covered by
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License;
they
are outside
its
scope. The
act
of
running a program using
the
Library is
not
restricted, and
output
from
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if
its
contents constitute a
work
based
on
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Library (independent
of
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use
of
the
Library
in
a
too
l
for
writing
it).
Whether
that
is
true
depends
on
what
the
Library does and
what
the
program
that
uses
the
Library does.
1. You may copy and distribute verbatim copies
of
the
Library's complete 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
not
ices
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refer
to
this
License and
to
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absence
of
any warranty; and distribute a copy
of
this
License along
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Library.
You may charge a fee
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option
offer
warranty
protection in exchange
for
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2. You may
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or
copies
of
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Library
or
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portion
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it,
thus
forming a
work
based
on
the
Library, 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) The modified
work
must
itself
be a
software
library.
b)
You
must
cause
the
files modified
to
carry prominent notices
stating
that
you changed
the
files and
the
date
of
any change.
c)
You
must
cause
the
whole
of
the
work
to
be licensed
at
no
charge
to
all
third
parties under
the
terms
of
this
License.
d)
If
a facility in
the
modified Library refers
to
a
function
or
a table
of
data
to
be supplied by an application program
that
uses
the
facility,
other
than
as
an
argument
passed when
the
facility is invoked,
then
you
must
make a good
faith
effort
to
ensure
that,
in
the
event an application does
not
supply such
function
or
table,
the
facility
still
operates, and
performs
whatever
part
of
its
purpose remains meaningful.
(For
example, a
function
in
a library
to
compute square
roots
has a purpose
that
is entirely well-defined independent
of
the
application. Therefore, Subsection
2d requires
that
any application-supplied function
or
table used
by
this
function
must
be optional:
if
the
application does
not
supply
it,
the
square
root
function
must
still
compute square roots.)
These requirements apply
to
the
modified
work
as
a whole.
If
identifiable sections
of
that
work
are
not
derived
from
the
Library, 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
Library,
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
Library.
In addition, mere aggregation
of
another
work
not
based on
the
Library
with
the
Library
(or
with
a
work
based
on
the
Library) on a volume
of
a storage
or
distribution medium does
not
bring
the
other
work
under
the
scope
of
this
License.
3. You may
opt
to
apply
the
terms
of
the
ordinary GNU General Public License instead
ofthis
License
to
a given copy
ofthe
Library. To do this, you
must
alter
all
the
notices
that
refer
to
this
License, so
that
they
refer
to
the
ordinary GNU General Public License, version 2, instead
of
to
this
License.
(If
a
newer
version
than
version 2
of
the
ordinary GNU General Public License has appeared,
then
you can specify
that
version instead
if
you wish.) Do
not
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other
change in these notices.
Once
this
change is made
in
a given copy,
it
is irreversible
for
that
copy, so
the
ordinary GNU General Public License applies
to
all subsequent copies and
derivative works made
from
that
copy.
This
option
is useful when you wish
to
copy
part
of
the
code
of
the
Library
into
a program
that
is
not
a library.
4. You may copy and distribute
the
Library
(or
a
portion
or
derivative
of
it, under Section
2)
in object code
or
executable
form
under
the
terms
of
Sections 1