2
Version 1.0, January 1, 2003
4
The Qwt library and included programs are provided under the terms
5
of the GNU LESSER GENERAL PUBLIC LICENSE (LGPL) with the following
8
1. Widgets that are subclassed from Qwt widgets do not
9
constitute a derivative work.
11
2. Static linking of applications and widgets to the
12
Qwt library does not constitute a derivative work
13
and does not require the author to provide source
14
code for the application or widget, use the shared
15
Qwt libraries, or link their applications or
16
widgets against a user-supplied version of Qwt.
18
If you link the application or widget to a modified
19
version of Qwt, then the changes to Qwt must be
20
provided under the terms of the LGPL in sections
23
3. You do not have to provide a copy of the Qwt license
24
with programs that are linked to the Qwt library, nor
25
do you have to identify the Qwt license in your
26
program or documentation as required by section 6
30
However, programs must still identify their use of Qwt.
31
The following example statement can be included in user
32
documentation to satisfy this requirement:
34
[program/widget] is based in part on the work of
35
the Qwt project (http://qwt.sf.net).
37
----------------------------------------------------------------------
40
GNU LESSER GENERAL PUBLIC LICENSE
41
Version 2.1, February 1999
43
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
44
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
45
Everyone is permitted to copy and distribute verbatim copies
46
of this license document, but changing it is not allowed.
48
[This is the first released version of the Lesser GPL. It also counts
49
as the successor of the GNU Library Public License, version 2, hence
50
the version number 2.1.]
54
The licenses for most software are designed to take away your
55
freedom to share and change it. By contrast, the GNU General Public
56
Licenses are intended to guarantee your freedom to share and change
57
free software--to make sure the software is free for all its users.
59
This license, the Lesser General Public License, applies to some
60
specially designated software packages--typically libraries--of the
61
Free Software Foundation and other authors who decide to use it. You
62
can use it too, but we suggest you first think carefully about whether
63
this license or the ordinary General Public License is the better
64
strategy to use in any particular case, based on the explanations below.
66
When we speak of free software, we are referring to freedom of use,
67
not price. Our General Public Licenses are designed to make sure that
68
you have the freedom to distribute copies of free software (and charge
69
for this service if you wish); that you receive source code or can get
70
it if you want it; that you can change the software and use pieces of
71
it in new free programs; and that you are informed that you can do
74
To protect your rights, we need to make restrictions that forbid
75
distributors to deny you these rights or to ask you to surrender these
76
rights. These restrictions translate to certain responsibilities for
77
you if you distribute copies of the library or if you modify it.
79
For example, if you distribute copies of the library, whether gratis
80
or for a fee, you must give the recipients all the rights that we gave
81
you. You must make sure that they, too, receive or can get the source
82
code. If you link other code with the library, you must provide
83
complete object files to the recipients, so that they can relink them
84
with the library after making changes to the library and recompiling
85
it. And you must show them these terms so they know their rights.
87
We protect your rights with a two-step method: (1) we copyright the
88
library, and (2) we offer you this license, which gives you legal
89
permission to copy, distribute and/or modify the library.
91
To protect each distributor, we want to make it very clear that
92
there is no warranty for the free library. Also, if the library is
93
modified by someone else and passed on, the recipients should know
94
that what they have is not the original version, so that the original
95
author's reputation will not be affected by problems that might be
98
Finally, software patents pose a constant threat to the existence of
99
any free program. We wish to make sure that a company cannot
100
effectively restrict the users of a free program by obtaining a
101
restrictive license from a patent holder. Therefore, we insist that
102
any patent license obtained for a version of the library must be
103
consistent with the full freedom of use specified in this license.
105
Most GNU software, including some libraries, is covered by the
106
ordinary GNU General Public License. This license, the GNU Lesser
107
General Public License, applies to certain designated libraries, and
108
is quite different from the ordinary General Public License. We use
109
this license for certain libraries in order to permit linking those
110
libraries into non-free programs.
112
When a program is linked with a library, whether statically or using
113
a shared library, the combination of the two is legally speaking a
114
combined work, a derivative of the original library. The ordinary
115
General Public License therefore permits such linking only if the
116
entire combination fits its criteria of freedom. The Lesser General
117
Public License permits more lax criteria for linking other code with
120
We call this license the "Lesser" General Public License because it
121
does Less to protect the user's freedom than the ordinary General
122
Public License. It also provides other free software developers Less
123
of an advantage over competing non-free programs. These disadvantages
124
are the reason we use the ordinary General Public License for many
125
libraries. However, the Lesser license provides advantages in certain
126
special circumstances.
128
For example, on rare occasions, there may be a special need to
129
encourage the widest possible use of a certain library, so that it becomes
130
a de-facto standard. To achieve this, non-free programs must be
131
allowed to use the library. A more frequent case is that a free
132
library does the same job as widely used non-free libraries. In this
133
case, there is little to gain by limiting the free library to free
134
software only, so we use the Lesser General Public License.
136
In other cases, permission to use a particular library in non-free
137
programs enables a greater number of people to use a large body of
138
free software. For example, permission to use the GNU C Library in
139
non-free programs enables many more people to use the whole GNU
140
operating system, as well as its variant, the GNU/Linux operating
143
Although the Lesser General Public License is Less protective of the
144
users' freedom, it does ensure that the user of a program that is
145
linked with the Library has the freedom and the wherewithal to run
146
that program using a modified version of the Library.
148
The precise terms and conditions for copying, distribution and
149
modification follow. Pay close attention to the difference between a
150
"work based on the library" and a "work that uses the library". The
151
former contains code derived from the library, whereas the latter must
152
be combined with the library in order to run.
154
GNU LESSER GENERAL PUBLIC LICENSE
155
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
157
0. This License Agreement applies to any software library or other
158
program which contains a notice placed by the copyright holder or
159
other authorized party saying it may be distributed under the terms of
160
this Lesser General Public License (also called "this License").
161
Each licensee is addressed as "you".
163
A "library" means a collection of software functions and/or data
164
prepared so as to be conveniently linked with application programs
165
(which use some of those functions and data) to form executables.
167
The "Library", below, refers to any such software library or work
168
which has been distributed under these terms. A "work based on the
169
Library" means either the Library or any derivative work under
170
copyright law: that is to say, a work containing the Library or a
171
portion of it, either verbatim or with modifications and/or translated
172
straightforwardly into another language. (Hereinafter, translation is
173
included without limitation in the term "modification".)
175
"Source code" for a work means the preferred form of the work for
176
making modifications to it. For a library, complete source code means
177
all the source code for all modules it contains, plus any associated
178
interface definition files, plus the scripts used to control compilation
179
and installation of the library.
181
Activities other than copying, distribution and modification are not
182
covered by this License; they are outside its scope. The act of
183
running a program using the Library is not restricted, and output from
184
such a program is covered only if its contents constitute a work based
185
on the Library (independent of the use of the Library in a tool for
186
writing it). Whether that is true depends on what the Library does
187
and what the program that uses the Library does.
189
1. You may copy and distribute verbatim copies of the Library's
190
complete source code as you receive it, in any medium, provided that
191
you conspicuously and appropriately publish on each copy an
192
appropriate copyright notice and disclaimer of warranty; keep intact
193
all the notices that refer to this License and to the absence of any
194
warranty; and distribute a copy of this License along with the
197
You may charge a fee for the physical act of transferring a copy,
198
and you may at your option offer warranty protection in exchange for a
201
2. You may modify your copy or copies of the Library or any portion
202
of it, thus forming a work based on the Library, and copy and
203
distribute such modifications or work under the terms of Section 1
204
above, provided that you also meet all of these conditions:
206
a) The modified work must itself be a software library.
208
b) You must cause the files modified to carry prominent notices
209
stating that you changed the files and the date of any change.
211
c) You must cause the whole of the work to be licensed at no
212
charge to all third parties under the terms of this License.
214
d) If a facility in the modified Library refers to a function or a
215
table of data to be supplied by an application program that uses
216
the facility, other than as an argument passed when the facility
217
is invoked, then you must make a good faith effort to ensure that,
218
in the event an application does not supply such function or
219
table, the facility still operates, and performs whatever part of
220
its purpose remains meaningful.
222
(For example, a function in a library to compute square roots has
223
a purpose that is entirely well-defined independent of the
224
application. Therefore, Subsection 2d requires that any
225
application-supplied function or table used by this function must
226
be optional: if the application does not supply it, the square
227
root function must still compute square roots.)
229
These requirements apply to the modified work as a whole. If
230
identifiable sections of that work are not derived from the Library,
231
and can be reasonably considered independent and separate works in
232
themselves, then this License, and its terms, do not apply to those
233
sections when you distribute them as separate works. But when you
234
distribute the same sections as part of a whole which is a work based
235
on the Library, the distribution of the whole must be on the terms of
236
this License, whose permissions for other licensees extend to the
237
entire whole, and thus to each and every part regardless of who wrote
240
Thus, it is not the intent of this section to claim rights or contest
241
your rights to work written entirely by you; rather, the intent is to
242
exercise the right to control the distribution of derivative or
243
collective works based on the Library.
245
In addition, mere aggregation of another work not based on the Library
246
with the Library (or with a work based on the Library) on a volume of
247
a storage or distribution medium does not bring the other work under
248
the scope of this License.
250
3. You may opt to apply the terms of the ordinary GNU General Public
251
License instead of this License to a given copy of the Library. To do
252
this, you must alter all the notices that refer to this License, so
253
that they refer to the ordinary GNU General Public License, version 2,
254
instead of to this License. (If a newer version than version 2 of the
255
ordinary GNU General Public License has appeared, then you can specify
256
that version instead if you wish.) Do not make any other change in
259
Once this change is made in a given copy, it is irreversible for
260
that copy, so the ordinary GNU General Public License applies to all
261
subsequent copies and derivative works made from that copy.
263
This option is useful when you wish to copy part of the code of
264
the Library into a program that is not a library.
266
4. You may copy and distribute the Library (or a portion or
267
derivative of it, under Section 2) in object code or executable form
268
under the terms of Sections 1 and 2 above provided that you accompany
269
it with the complete corresponding machine-readable source code, which
270
must be distributed under the terms of Sections 1 and 2 above on a
271
medium customarily used for software interchange.
273
If distribution of object code is made by offering access to copy
274
from a designated place, then offering equivalent access to copy the
275
source code from the same place satisfies the requirement to
276
distribute the source code, even though third parties are not
277
compelled to copy the source along with the object code.
279
5. A program that contains no derivative of any portion of the
280
Library, but is designed to work with the Library by being compiled or
281
linked with it, is called a "work that uses the Library". Such a
282
work, in isolation, is not a derivative work of the Library, and
283
therefore falls outside the scope of this License.
285
However, linking a "work that uses the Library" with the Library
286
creates an executable that is a derivative of the Library (because it
287
contains portions of the Library), rather than a "work that uses the
288
library". The executable is therefore covered by this License.
289
Section 6 states terms for distribution of such executables.
291
When a "work that uses the Library" uses material from a header file
292
that is part of the Library, the object code for the work may be a
293
derivative work of the Library even though the source code is not.
294
Whether this is true is especially significant if the work can be
295
linked without the Library, or if the work is itself a library. The
296
threshold for this to be true is not precisely defined by law.
298
If such an object file uses only numerical parameters, data
299
structure layouts and accessors, and small macros and small inline
300
functions (ten lines or less in length), then the use of the object
301
file is unrestricted, regardless of whether it is legally a derivative
302
work. (Executables containing this object code plus portions of the
303
Library will still fall under Section 6.)
305
Otherwise, if the work is a derivative of the Library, you may
306
distribute the object code for the work under the terms of Section 6.
307
Any executables containing that work also fall under Section 6,
308
whether or not they are linked directly with the Library itself.
310
6. As an exception to the Sections above, you may also combine or
311
link a "work that uses the Library" with the Library to produce a
312
work containing portions of the Library, and distribute that work
313
under terms of your choice, provided that the terms permit
314
modification of the work for the customer's own use and reverse
315
engineering for debugging such modifications.
317
You must give prominent notice with each copy of the work that the
318
Library is used in it and that the Library and its use are covered by
319
this License. You must supply a copy of this License. If the work
320
during execution displays copyright notices, you must include the
321
copyright notice for the Library among them, as well as a reference
322
directing the user to the copy of this License. Also, you must do one
325
a) Accompany the work with the complete corresponding
326
machine-readable source code for the Library including whatever
327
changes were used in the work (which must be distributed under
328
Sections 1 and 2 above); and, if the work is an executable linked
329
with the Library, with the complete machine-readable "work that
330
uses the Library", as object code and/or source code, so that the
331
user can modify the Library and then relink to produce a modified
332
executable containing the modified Library. (It is understood
333
that the user who changes the contents of definitions files in the
334
Library will not necessarily be able to recompile the application
335
to use the modified definitions.)
337
b) Use a suitable shared library mechanism for linking with the
338
Library. A suitable mechanism is one that (1) uses at run time a
339
copy of the library already present on the user's computer system,
340
rather than copying library functions into the executable, and (2)
341
will operate properly with a modified version of the library, if
342
the user installs one, as long as the modified version is
343
interface-compatible with the version that the work was made with.
345
c) Accompany the work with a written offer, valid for at
346
least three years, to give the same user the materials
347
specified in Subsection 6a, above, for a charge no more
348
than the cost of performing this distribution.
350
d) If distribution of the work is made by offering access to copy
351
from a designated place, offer equivalent access to copy the above
352
specified materials from the same place.
354
e) Verify that the user has already received a copy of these
355
materials or that you have already sent this user a copy.
357
For an executable, the required form of the "work that uses the
358
Library" must include any data and utility programs needed for
359
reproducing the executable from it. However, as a special exception,
360
the materials to be distributed need not include anything that is
361
normally distributed (in either source or binary form) with the major
362
components (compiler, kernel, and so on) of the operating system on
363
which the executable runs, unless that component itself accompanies
366
It may happen that this requirement contradicts the license
367
restrictions of other proprietary libraries that do not normally
368
accompany the operating system. Such a contradiction means you cannot
369
use both them and the Library together in an executable that you
372
7. You may place library facilities that are a work based on the
373
Library side-by-side in a single library together with other library
374
facilities not covered by this License, and distribute such a combined
375
library, provided that the separate distribution of the work based on
376
the Library and of the other library facilities is otherwise
377
permitted, and provided that you do these two things:
379
a) Accompany the combined library with a copy of the same work
380
based on the Library, uncombined with any other library
381
facilities. This must be distributed under the terms of the
384
b) Give prominent notice with the combined library of the fact
385
that part of it is a work based on the Library, and explaining
386
where to find the accompanying uncombined form of the same work.
388
8. You may not copy, modify, sublicense, link with, or distribute
389
the Library except as expressly provided under this License. Any
390
attempt otherwise to copy, modify, sublicense, link with, or
391
distribute the Library is void, and will automatically terminate your
392
rights under this License. However, parties who have received copies,
393
or rights, from you under this License will not have their licenses
394
terminated so long as such parties remain in full compliance.
396
9. You are not required to accept this License, since you have not
397
signed it. However, nothing else grants you permission to modify or
398
distribute the Library or its derivative works. These actions are
399
prohibited by law if you do not accept this License. Therefore, by
400
modifying or distributing the Library (or any work based on the
401
Library), you indicate your acceptance of this License to do so, and
402
all its terms and conditions for copying, distributing or modifying
403
the Library or works based on it.
405
10. Each time you redistribute the Library (or any work based on the
406
Library), the recipient automatically receives a license from the
407
original licensor to copy, distribute, link with or modify the Library
408
subject to these terms and conditions. You may not impose any further
409
restrictions on the recipients' exercise of the rights granted herein.
410
You are not responsible for enforcing compliance by third parties with
413
11. If, as a consequence of a court judgment or allegation of patent
414
infringement or for any other reason (not limited to patent issues),
415
conditions are imposed on you (whether by court order, agreement or
416
otherwise) that contradict the conditions of this License, they do not
417
excuse you from the conditions of this License. If you cannot
418
distribute so as to satisfy simultaneously your obligations under this
419
License and any other pertinent obligations, then as a consequence you
420
may not distribute the Library at all. For example, if a patent
421
license would not permit royalty-free redistribution of the Library by
422
all those who receive copies directly or indirectly through you, then
423
the only way you could satisfy both it and this License would be to
424
refrain entirely from distribution of the Library.
426
If any portion of this section is held invalid or unenforceable under any
427
particular circumstance, the balance of the section is intended to apply,
428
and the section as a whole is intended to apply in other circumstances.
430
It is not the purpose of this section to induce you to infringe any
431
patents or other property right claims or to contest validity of any
432
such claims; this section has the sole purpose of protecting the
433
integrity of the free software distribution system which is
434
implemented by public license practices. Many people have made
435
generous contributions to the wide range of software distributed
436
through that system in reliance on consistent application of that
437
system; it is up to the author/donor to decide if he or she is willing
438
to distribute software through any other system and a licensee cannot
441
This section is intended to make thoroughly clear what is believed to
442
be a consequence of the rest of this License.
444
12. If the distribution and/or use of the Library is restricted in
445
certain countries either by patents or by copyrighted interfaces, the
446
original copyright holder who places the Library under this License may add
447
an explicit geographical distribution limitation excluding those countries,
448
so that distribution is permitted only in or among countries not thus
449
excluded. In such case, this License incorporates the limitation as if
450
written in the body of this License.
452
13. The Free Software Foundation may publish revised and/or new
453
versions of the Lesser General Public License from time to time.
454
Such new versions will be similar in spirit to the present version,
455
but may differ in detail to address new problems or concerns.
457
Each version is given a distinguishing version number. If the Library
458
specifies a version number of this License which applies to it and
459
"any later version", you have the option of following the terms and
460
conditions either of that version or of any later version published by
461
the Free Software Foundation. If the Library does not specify a
462
license version number, you may choose any version ever published by
463
the Free Software Foundation.
465
14. If you wish to incorporate parts of the Library into other free
466
programs whose distribution conditions are incompatible with these,
467
write to the author to ask for permission. For software which is
468
copyrighted by the Free Software Foundation, write to the Free
469
Software Foundation; we sometimes make exceptions for this. Our
470
decision will be guided by the two goals of preserving the free status
471
of all derivatives of our free software and of promoting the sharing
472
and reuse of software generally.
476
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
477
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
478
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
479
OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
480
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
481
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
482
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
483
LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
484
THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
486
16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
487
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
488
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
489
FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
490
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
491
LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
492
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
493
FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
494
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
497
END OF TERMS AND CONDITIONS
499
How to Apply These Terms to Your New Libraries
501
If you develop a new library, and you want it to be of the greatest
502
possible use to the public, we recommend making it free software that
503
everyone can redistribute and change. You can do so by permitting
504
redistribution under these terms (or, alternatively, under the terms of the
505
ordinary General Public License).
507
To apply these terms, attach the following notices to the library. It is
508
safest to attach them to the start of each source file to most effectively
509
convey the exclusion of warranty; and each file should have at least the
510
"copyright" line and a pointer to where the full notice is found.
512
<one line to give the library's name and a brief idea of what it does.>
513
Copyright (C) <year> <name of author>
515
This library is free software; you can redistribute it and/or
516
modify it under the terms of the GNU Lesser General Public
517
License as published by the Free Software Foundation; either
518
version 2.1 of the License, or (at your option) any later version.
520
This library is distributed in the hope that it will be useful,
521
but WITHOUT ANY WARRANTY; without even the implied warranty of
522
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
523
Lesser General Public License for more details.
525
You should have received a copy of the GNU Lesser General Public
526
License along with this library; if not, write to the Free Software
527
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
529
Also add information on how to contact you by electronic and paper mail.
531
You should also get your employer (if you work as a programmer) or your
532
school, if any, to sign a "copyright disclaimer" for the library, if
533
necessary. Here is a sample; alter the names:
535
Yoyodyne, Inc., hereby disclaims all copyright interest in the
536
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
538
<signature of Ty Coon>, 1 April 1990
539
Ty Coon, President of Vice
541
That's all there is to it!