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[This is the fir st r eleasrsion of the
Lesser GPL. It also counts as the successor
of the GNU Libr ar y Public License, ver sion
2, hence the ver sion numbe r 2.1.]
Preamble
The licenses for most softwar e ar e designed
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software--to make su re the softwa re is f ree
for all its users.
This lir General Public
License, app lies to some sp eciall
designated software packages pically
libra r ies--of the Free Softwa re Foundation
and other autho r s who d
can use it too, but we suggest you fir st think
carefully about whethe r this license or the
or dina r y General Public License is the
better st r ategy to use in any p ar ticula r ca
se,
based on the exp lanati
When we speak of free softwa r e, we are
refe rring to reedom of use, not price. Ou r
Gener al Public Licr e designed to
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To protect y r rights, we need to make
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Most GNU softwar e, includin
libra r ies, is covered by the o r dinary GNU
General Public License. This license, the
GNU Lesser Gene r al Publi
app lies to ce r tain designated lib r ar ie
s, and
is quite different f rom the o r dinary Gene ral
Public License. We use this license for
certain lib ra ries in o r der to pe r mit lin
those libra r ies into non-free pr ograms.
When a pr ogram is linked with a lib ra ry,
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Public License ther efor e p er mits such
linkingr e combination fits its
cr iter ia of f r eed
om. The Lesser Genr al
Public License p er mits mor e lax cr ite r ia fo r
linking other code with the lib ra ry.
We call this license the “Lesser” Gen ral
Public License because it does Less to
protect the use r's f reedom than the o rdina ry
General Public License. It also provides
other fr ee softwa r e develo p er s Less of an
advantar com peting nree
prog rams. These disadvantages are the
reason we use the o rdina ry Gene ral Pu
License for many lib r ar ies. Howeve r , the
Lesser license pr ovid
certain s pecial ci rcumstances.
For exam p le
, on ra re occasions, the re may
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possible use of a ce rtain lib ra ry, so that it
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used non-fr ee lira r ies. In this case, ther e is
little to gain by limiting the fr ee lib r ar y to
fr ee softwar e only, so we use the Lesser
General Public License.
In other cases, p er mission to use a
pa rticulr libra ry in non-f ree pr ograms
enables a greate r numbe r of peo ple
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a lar ge body of free softwa re. Fo r exam ple,
pe rmission to use the GNU C Lib ra ry in non-
fr ee pr ogr ams enables r e p eop le
to use the whole GNU op er ating syst
well as itsr iant, the GNU/Linux op er ating
system.
Although the Lesser Gene r al Pu
is Less protective of the use rs’ f r eedo
does ensur e that the user of a pr og r am that
is linked with the Libra r y hasreedom
and the whr ewithal to run that pr ogr am
using a modified ver sion of the Libr ar y.
The pr ecise ter ms and conditir
cop yi
ng, distribution and mo
follow. Pay close attention to the differ ence
between a r k based on the libra r y” and a
“work that uses the lib ra ry”. The fo rme r
contains code der ived from the lib ra ry,
whereas the latte r must be combined with
the libra r y in orde r to run.
TERMS AND CONDITIONS FOR
COPYING, DISTRIBUTION AND
MODIFICATION
0. This License Agr eement a pp lies to any
software lib ra ry o r othe r prog ram which
contains a notice p laced by the
cop yr ight r or other autho r ized
pa rty saying ir ibuted ur
the ter ms of this Lesser Gene r al Pu
License (also called “this License”).
Each licensee is addr essed as “you”.
A “libra ry” means a collection of
software functions and/o r data
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some of those functions and data) to
for m executables.
The “Libra r y”,refe r s to any such
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distr ib
uted under these te rms. A “wo rk
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containing the Libr ar y o r a p or tion of it,
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another language. (Her einafter ,
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limitation in the ter m “modification”
“Sour ce co r a wo r k means the
prefe rr ed fo rm of the wo rk fr maki
modifications to it. For a lib r ar y,
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mp lete sou r ce code means all the
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files, plus the sc ri pts used to cont r ol
comp ilation and
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Activities other than cop ying,
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it). Whether that is t rue de pends on
wh
at the Libra r y does and what the
prog ram that uses the Lib ra ry does.
1. You mapy and dist r ibute verbatim
cop ies of the Lib r ar y's com p lete sou r ce
code asreceive it, in any medium,
provided that you cons picuously and
appr opr iatep ublish on each cop y an
appr opr iate p yr ight notice and
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the notices that refe r to this License and
to the absence of any warr anty; and
distr ibute a co p y of this License along
with the Libr ar y.
You may char ge a fee for the p hysical
act of transfe rr ing a cop y, and you may
at your o ption offe r wa rranty prot
ectio
in exchanger a fee.
2. You may modify your cop y or co pies of
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forming a wo rk based on the Lib ra ry,
and cop y and distr ibute such
modifications or wo r k under the te rms
of Section 1 above, provided that you
also meet all of these conditions:
a)rk must itself be a
softwar e libra r y.
b)
carr y pr ominent notices stating that
you changed th
any change.
c)rk
tor ge to all thir d
pa rties unde r the te rms of this
Licen
d)r ar y
refe rs to a function o r a table of da
to
be supp lied by an a pp lication
prog ram that uses the facility, othe r
than as an argument passed when
the facility is invoked, then you must
make a good faith effor t to ensur e
that, in the event an app lication does
not supp ly such function o r table, the
facility still ope rates, and pe rfo rms
whatever p ar t of its p urp ose r emai
meaningful.
(For exam p le, a function in a lib r ar y to
comp ute squar e r oots has a p urp ose
that is entir ely well-definpendent
of the app licatrefo re,
Subsection 2d requi r es that any
app licatipp lied function o r table
used by this function must bp tional:
if
the app lication does not su pp ly it, the
square root function must still com pute
square r oots.)
These r equir ementpply to the
modified wor k as a whole. If identifiable
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wor ks in themselves, then this License,
and its terms, do not a pp ly to those
sections when you distribute them as
sepa rate wo rks. But when you dist ribute
the same sections as p ar t of a whole
which is a work based on the L ra r y,
the distr ibution of the whole mu
the ter ms of this License, whose
pe rmissions fo r othe r licensees extend
to the entire whole, and thus to each
and every pa rt reg
ar dless of r ote
it.
Thus, it is not the intent of this section to
claim r ights o r contest your r ights to
wor k wr itten entir ely by you; r ather , the
intent is to exer cise the r ight to cont r ol
the distr ibution of de r ivativr
collective works based on the Lib ra ry.
In addition, mer e agg r egation of
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distr ibution medium does not br ing the
other wo r k under the scop e of
this
License.
3. You may opt to a pp ly the te rms of the
or dina r y GNU Gene r al Public License
instead of this License to a gp y of
the Libr ar y. To do this, you must alter all
the notices that r efer to this License, so
that they refe r to the o rdina ry GNU
Gener al Public License, ve r sion 2,
instead of to this License. (If a newer
ver sion t r sion 2 of the or dina r y
GNU General Public License has
app ear ed, then you can sp ecify that
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notices.
Once this change is made in a given
cop y, it is irr ever sible for that co p y,
the or dina r y GNU Geral Public
License app lies to all sub
cop ies and r
ivative works ma
de fr om
that cop y.
This option is useful when you wish to
copy pa rt of the code of the Lib ra ry into
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4. You may cop y anribute the Lib ra ry
(or a p or tion o r de r ivative of it, under
Section 2) in object code or executable
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2 above pr ovided that you accp any it
with the comp lete corr esp onding
machine-r eadable sour ce code, which
must be distr ibuted unde r the ter ms of
Sections 1 and 2 above on a medium
customar ily used fo r softwa r e
interchange.
If distr ibution of object c
offer i
ng access to copy f rom a
designap lace, then offer ing
equivalent access to cop y the sou r ce
code from the same p lace satisfies the
requi rement to dist ribute the sou rce
code, even though third p a r ties a re not
compelled to co py the sou rce along
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5. A prog ram that contains no de rivat
any p or tion of the Libr ar y, but is
designed tork with the Lib ra r y by
being cop iled or linked with it, is
called a “work that ra ry”.
Such a wor k, in is
der ivative wo r k of the Libr ar y, and
ther efor e falls outside the scop e of this
License.
How
ever , linking a “wo r k that uses the
Libra ry” with the Lib ra ry c reates an
executable that is a derivative of the
Libra ry (because it contains po r tions of
the Libr ar y), r atr than a “wo rk that
uses the libr ar y”. The executable is
ther efor e cove r ed by this License.
Section 6 states ter ms fo r dist r ibution of
such executables.
When a “work that uses the Lib ra ry”
uses mater ial f r om a header file that is
pa rt of the Lib ra ry, the object code fo r
the wor k may be a de r ivativerk of the
Libra ry even though the sou r ce code is
not. Whether this is tr ue is esp e
cially
significant if the work can be lin
without the Libra r y, o r if the wo r k is itself
a libra r y. The thr eshold for this to be t rue
is not precisel
If such an object file uses only
numer ical p ar ameter s, data str uctur e
layouts and accessor s, an
macr os and small inline functi
lines or less in length), then the use of
the object file is unr estr icted,
rega rdless of whethe r it is legally a
der ivative work. (Executables
containing this object code p lu
po rtions of the Lib ra ry will still falr
Section 6.)
Other wise, if the wor k is a de r ivative of
the Libr ar y, you may dist r ibute the
object code for the wo rk unde r the
ter m
s of Section 6. Any executables
containing that wor k also fall unr
Section 6, whether o r not they ar e linked
directly with the Lib ra r y
6. As an excep tion to the Sections above,
you may also combine or link a “wo rk
that uses the Libr ar y” with the Libr ar y to
produce a wo rk containing po rtions of
the Libr ar y, and dr ibute that work
under ter ms of you r choice, pr ov
that the ter ms p er mit modification of
the work fo r the custome r’s own use
and r ever se engineer ing fo r debugging
such modifications.
You must give prominent notice with
each cop y of the wor k that the Libr ar y i
s
used in it and that the Libra r y an
use ar e cove r ed by this License. You
must supp ly a co p y of this
wor k du r ing execution disp lays
copy right notices, you must include the
copy right notice fo r the Lib ra ry among
them, as well as a refe rence di recting
the user to the cop y of this License.
Also, you must do one of these things:
a)pany the wo rk with the
comp lete corr esp onding mac
readable sou rce code fo r the Lib ra ry
including whr changes we re
used in the work (which must be
distr ibuted unde r Sections 1 and 2
above); and, if the work is an
executable linked with the Libra ry,
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