blob: 9542075220967c30f071989da0ee4ff9d57fe970 [file] [log] [blame]
Brad Bishopd7bf8c12018-02-25 22:55:05 -05001 FLTK License
2 December 11, 2001
3
4The FLTK library and included programs are provided under the terms
5of the GNU Library General Public License (LGPL) with the following
6exceptions:
7
8 1. Modifications to the FLTK configure script, config
9 header file, and makefiles by themselves to support
10 a specific platform do not constitute a modified or
11 derivative work.
12
13 The authors do request that such modifications be
14 contributed to the FLTK project - send all contributions
15 through the "Software Trouble Report" on the following page:
16
17 http://www.fltk.org/str.php
18
19 2. Widgets that are subclassed from FLTK widgets do not
20 constitute a derivative work.
21
22 3. Static linking of applications and widgets to the
23 FLTK library does not constitute a derivative work
24 and does not require the author to provide source
25 code for the application or widget, use the shared
26 FLTK libraries, or link their applications or
27 widgets against a user-supplied version of FLTK.
28
29 If you link the application or widget to a modified
30 version of FLTK, then the changes to FLTK must be
31 provided under the terms of the LGPL in sections
32 1, 2, and 4.
33
34 4. You do not have to provide a copy of the FLTK license
35 with programs that are linked to the FLTK library, nor
36 do you have to identify the FLTK license in your
37 program or documentation as required by section 6
38 of the LGPL.
39
40 However, programs must still identify their use of FLTK.
41 The following example statement can be included in user
42 documentation to satisfy this requirement:
43
44 [program/widget] is based in part on the work of
45 the FLTK project (http://www.fltk.org).
46
47-----------------------------------------------------------------------
48
49 GNU LIBRARY GENERAL PUBLIC LICENSE
50 Version 2, June 1991
51
52 Copyright (C) 1991 Free Software Foundation, Inc.
53 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
54
55 Everyone is permitted to copy and distribute verbatim copies
56 of this license document, but changing it is not allowed.
57
58 [This is the first released version of the library GPL. It is
59 numbered 2 because it goes with version 2 of the ordinary GPL.]
60
61 Preamble
62
63 The licenses for most software are designed to take away your
64freedom to share and change it. By contrast, the GNU General Public
65Licenses are intended to guarantee your freedom to share and change
66free software--to make sure the software is free for all its users.
67
68 This license, the Library General Public License, applies to some
69specially designated Free Software Foundation software, and to any
70other libraries whose authors decide to use it. You can use it for
71your libraries, too.
72
73 When we speak of free software, we are referring to freedom, not
74price. Our General Public Licenses are designed to make sure that you
75have the freedom to distribute copies of free software (and charge for
76this service if you wish), that you receive source code or can get it
77if you want it, that you can change the software or use pieces of it
78in new free programs; and that you know you can do these things.
79
80 To protect your rights, we need to make restrictions that forbid
81anyone to deny you these rights or to ask you to surrender the rights.
82These restrictions translate to certain responsibilities for you if
83you distribute copies of the library, or if you modify it.
84
85 For example, if you distribute copies of the library, whether gratis
86or for a fee, you must give the recipients all the rights that we gave
87you. You must make sure that they, too, receive or can get the source
88code. If you link a program with the library, you must provide
89complete object files to the recipients so that they can relink them
90with the library, after making changes to the library and recompiling
91it. And you must show them these terms so they know their rights.
92
93 Our method of protecting your rights has two steps: (1) copyright
94the library, and (2) offer you this license which gives you legal
95permission to copy, distribute and/or modify the library.
96
97 Also, for each distributor's protection, we want to make certain
98that everyone understands that there is no warranty for this free
99library. If the library is modified by someone else and passed on, we
100want its recipients to know that what they have is not the original
101version, so that any problems introduced by others will not reflect on
102the original authors' reputations.
103
104 Finally, any free program is threatened constantly by software
105patents. We wish to avoid the danger that companies distributing free
106software will individually obtain patent licenses, thus in effect
107transforming the program into proprietary software. To prevent this,
108we have made it clear that any patent must be licensed for everyone's
109free use or not licensed at all.
110
111 Most GNU software, including some libraries, is covered by the ordinary
112GNU General Public License, which was designed for utility programs. This
113license, the GNU Library General Public License, applies to certain
114designated libraries. This license is quite different from the ordinary
115one; be sure to read it in full, and don't assume that anything in it is
116the same as in the ordinary license.
117
118 The reason we have a separate public license for some libraries is that
119they blur the distinction we usually make between modifying or adding to a
120program and simply using it. Linking a program with a library, without
121changing the library, is in some sense simply using the library, and is
122analogous to running a utility program or application program. However, in
123a textual and legal sense, the linked executable is a combined work, a
124derivative of the original library, and the ordinary General Public License
125treats it as such.
126
127 Because of this blurred distinction, using the ordinary General
128Public License for libraries did not effectively promote software
129sharing, because most developers did not use the libraries. We
130concluded that weaker conditions might promote sharing better.
131
132 However, unrestricted linking of non-free programs would deprive the
133users of those programs of all benefit from the free status of the
134libraries themselves. This Library General Public License is intended to
135permit developers of non-free programs to use free libraries, while
136preserving your freedom as a user of such programs to change the free
137libraries that are incorporated in them. (We have not seen how to achieve
138this as regards changes in header files, but we have achieved it as regards
139changes in the actual functions of the Library.) The hope is that this
140will lead to faster development of free libraries.
141
142 The precise terms and conditions for copying, distribution and
143modification follow. Pay close attention to the difference between a
144"work based on the library" and a "work that uses the library". The
145former contains code derived from the library, while the latter only
146works together with the library.
147
148 Note that it is possible for a library to be covered by the ordinary
149General Public License rather than by this special one.
150
151 GNU LIBRARY GENERAL PUBLIC LICENSE
152 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
153
154 0. This License Agreement applies to any software library which
155contains a notice placed by the copyright holder or other authorized
156party saying it may be distributed under the terms of this Library
157General Public License (also called "this License"). Each licensee is
158addressed as "you".
159
160 A "library" means a collection of software functions and/or data
161prepared so as to be conveniently linked with application programs
162(which use some of those functions and data) to form executables.
163
164 The "Library", below, refers to any such software library or work
165which has been distributed under these terms. A "work based on the
166Library" means either the Library or any derivative work under
167copyright law: that is to say, a work containing the Library or a
168portion of it, either verbatim or with modifications and/or translated
169straightforwardly into another language. (Hereinafter, translation is
170included without limitation in the term "modification".)
171
172 "Source code" for a work means the preferred form of the work for
173making modifications to it. For a library, complete source code means
174all the source code for all modules it contains, plus any associated
175interface definition files, plus the scripts used to control compilation
176and installation of the library.
177
178 Activities other than copying, distribution and modification are not
179covered by this License; they are outside its scope. The act of
180running a program using the Library is not restricted, and output from
181such a program is covered only if its contents constitute a work based
182on the Library (independent of the use of the Library in a tool for
183writing it). Whether that is true depends on what the Library does
184and what the program that uses the Library does.
185
186 1. You may copy and distribute verbatim copies of the Library's
187complete source code as you receive it, in any medium, provided that
188you conspicuously and appropriately publish on each copy an
189appropriate copyright notice and disclaimer of warranty; keep intact
190all the notices that refer to this License and to the absence of any
191warranty; and distribute a copy of this License along with the
192Library.
193
194 You may charge a fee for the physical act of transferring a copy,
195and you may at your option offer warranty protection in exchange for a
196fee.
197
198 2. You may modify your copy or copies of the Library or any portion
199of it, thus forming a work based on the Library, and copy and
200distribute such modifications or work under the terms of Section 1
201above, provided that you also meet all of these conditions:
202
203 a) The modified work must itself be a software library.
204
205 b) You must cause the files modified to carry prominent notices
206 stating that you changed the files and the date of any change.
207
208 c) You must cause the whole of the work to be licensed at no
209 charge to all third parties under the terms of this License.
210
211 d) If a facility in the modified Library refers to a function or a
212 table of data to be supplied by an application program that uses
213 the facility, other than as an argument passed when the facility
214 is invoked, then you must make a good faith effort to ensure that,
215 in the event an application does not supply such function or
216 table, the facility still operates, and performs whatever part of
217 its purpose remains meaningful.
218
219 (For example, a function in a library to compute square roots has
220 a purpose that is entirely well-defined independent of the
221 application. Therefore, Subsection 2d requires that any
222 application-supplied function or table used by this function must
223 be optional: if the application does not supply it, the square
224 root function must still compute square roots.)
225
226These requirements apply to the modified work as a whole. If
227identifiable sections of that work are not derived from the Library,
228and can be reasonably considered independent and separate works in
229themselves, then this License, and its terms, do not apply to those
230sections when you distribute them as separate works. But when you
231distribute the same sections as part of a whole which is a work based
232on the Library, the distribution of the whole must be on the terms of
233this License, whose permissions for other licensees extend to the
234entire whole, and thus to each and every part regardless of who wrote
235it.
236
237Thus, it is not the intent of this section to claim rights or contest
238your rights to work written entirely by you; rather, the intent is to
239exercise the right to control the distribution of derivative or
240collective works based on the Library.
241
242In addition, mere aggregation of another work not based on the Library
243with the Library (or with a work based on the Library) on a volume of
244a storage or distribution medium does not bring the other work under
245the scope of this License.
246
247 3. You may opt to apply the terms of the ordinary GNU General Public
248License instead of this License to a given copy of the Library. To do
249this, you must alter all the notices that refer to this License, so
250that they refer to the ordinary GNU General Public License, version 2,
251instead of to this License. (If a newer version than version 2 of the
252ordinary GNU General Public License has appeared, then you can specify
253that version instead if you wish.) Do not make any other change in
254these notices.
255
256 Once this change is made in a given copy, it is irreversible for
257that copy, so the ordinary GNU General Public License applies to all
258subsequent copies and derivative works made from that copy.
259
260 This option is useful when you wish to copy part of the code of
261the Library into a program that is not a library.
262
263 4. You may copy and distribute the Library (or a portion or
264derivative of it, under Section 2) in object code or executable form
265under the terms of Sections 1 and 2 above provided that you accompany
266it with the complete corresponding machine-readable source code, which
267must be distributed under the terms of Sections 1 and 2 above on a
268medium customarily used for software interchange.
269
270 If distribution of object code is made by offering access to copy
271from a designated place, then offering equivalent access to copy the
272source code from the same place satisfies the requirement to
273distribute the source code, even though third parties are not
274compelled to copy the source along with the object code.
275
276 5. A program that contains no derivative of any portion of the
277Library, but is designed to work with the Library by being compiled or
278linked with it, is called a "work that uses the Library". Such a
279work, in isolation, is not a derivative work of the Library, and
280therefore falls outside the scope of this License.
281
282 However, linking a "work that uses the Library" with the Library
283creates an executable that is a derivative of the Library (because it
284contains portions of the Library), rather than a "work that uses the
285library". The executable is therefore covered by this License.
286Section 6 states terms for distribution of such executables.
287
288 When a "work that uses the Library" uses material from a header file
289that is part of the Library, the object code for the work may be a
290derivative work of the Library even though the source code is not.
291Whether this is true is especially significant if the work can be
292linked without the Library, or if the work is itself a library. The
293threshold for this to be true is not precisely defined by law.
294
295 If such an object file uses only numerical parameters, data
296structure layouts and accessors, and small macros and small inline
297functions (ten lines or less in length), then the use of the object
298file is unrestricted, regardless of whether it is legally a derivative
299work. (Executables containing this object code plus portions of the
300Library will still fall under Section 6.)
301
302 Otherwise, if the work is a derivative of the Library, you may
303distribute the object code for the work under the terms of Section 6.
304Any executables containing that work also fall under Section 6,
305whether or not they are linked directly with the Library itself.
306
307 6. As an exception to the Sections above, you may also compile or
308link a "work that uses the Library" with the Library to produce a
309work containing portions of the Library, and distribute that work
310under terms of your choice, provided that the terms permit
311modification of the work for the customer's own use and reverse
312engineering for debugging such modifications.
313
314 You must give prominent notice with each copy of the work that the
315Library is used in it and that the Library and its use are covered by
316this License. You must supply a copy of this License. If the work
317during execution displays copyright notices, you must include the
318copyright notice for the Library among them, as well as a reference
319directing the user to the copy of this License. Also, you must do one
320of these things:
321
322 a) Accompany the work with the complete corresponding
323 machine-readable source code for the Library including whatever
324 changes were used in the work (which must be distributed under
325 Sections 1 and 2 above); and, if the work is an executable linked
326 with the Library, with the complete machine-readable "work that
327 uses the Library", as object code and/or source code, so that the
328 user can modify the Library and then relink to produce a modified
329 executable containing the modified Library. (It is understood
330 that the user who changes the contents of definitions files in the
331 Library will not necessarily be able to recompile the application
332 to use the modified definitions.)
333
334 b) Accompany the work with a written offer, valid for at
335 least three years, to give the same user the materials
336 specified in Subsection 6a, above, for a charge no more
337 than the cost of performing this distribution.
338
339 c) If distribution of the work is made by offering access to copy
340 from a designated place, offer equivalent access to copy the above
341 specified materials from the same place.
342
343 d) Verify that the user has already received a copy of these
344 materials or that you have already sent this user a copy.
345
346 For an executable, the required form of the "work that uses the
347Library" must include any data and utility programs needed for
348reproducing the executable from it. However, as a special exception,
349the source code distributed need not include anything that is normally
350distributed (in either source or binary form) with the major
351components (compiler, kernel, and so on) of the operating system on
352which the executable runs, unless that component itself accompanies
353the executable.
354
355 It may happen that this requirement contradicts the license
356restrictions of other proprietary libraries that do not normally
357accompany the operating system. Such a contradiction means you cannot
358use both them and the Library together in an executable that you
359distribute.
360
361 7. You may place library facilities that are a work based on the
362Library side-by-side in a single library together with other library
363facilities not covered by this License, and distribute such a combined
364library, provided that the separate distribution of the work based on
365the Library and of the other library facilities is otherwise
366permitted, and provided that you do these two things:
367
368 a) Accompany the combined library with a copy of the same work
369 based on the Library, uncombined with any other library
370 facilities. This must be distributed under the terms of the
371 Sections above.
372
373 b) Give prominent notice with the combined library of the fact
374 that part of it is a work based on the Library, and explaining
375 where to find the accompanying uncombined form of the same work.
376
377 8. You may not copy, modify, sublicense, link with, or distribute
378the Library except as expressly provided under this License. Any
379attempt otherwise to copy, modify, sublicense, link with, or
380distribute the Library is void, and will automatically terminate your
381rights under this License. However, parties who have received copies,
382or rights, from you under this License will not have their licenses
383terminated so long as such parties remain in full compliance.
384
385 9. You are not required to accept this License, since you have not
386signed it. However, nothing else grants you permission to modify or
387distribute the Library or its derivative works. These actions are
388prohibited by law if you do not accept this License. Therefore, by
389modifying or distributing the Library (or any work based on the
390Library), you indicate your acceptance of this License to do so, and
391all its terms and conditions for copying, distributing or modifying
392the Library or works based on it.
393
394 10. Each time you redistribute the Library (or any work based on the
395Library), the recipient automatically receives a license from the
396original licensor to copy, distribute, link with or modify the Library
397subject to these terms and conditions. You may not impose any further
398restrictions on the recipients' exercise of the rights granted herein.
399You are not responsible for enforcing compliance by third parties to
400this License.
401
402 11. If, as a consequence of a court judgment or allegation of patent
403infringement or for any other reason (not limited to patent issues),
404conditions are imposed on you (whether by court order, agreement or
405otherwise) that contradict the conditions of this License, they do not
406excuse you from the conditions of this License. If you cannot
407distribute so as to satisfy simultaneously your obligations under this
408License and any other pertinent obligations, then as a consequence you
409may not distribute the Library at all. For example, if a patent
410license would not permit royalty-free redistribution of the Library by
411all those who receive copies directly or indirectly through you, then
412the only way you could satisfy both it and this License would be to
413refrain entirely from distribution of the Library.
414
415If any portion of this section is held invalid or unenforceable under any
416particular circumstance, the balance of the section is intended to apply,
417and the section as a whole is intended to apply in other circumstances.
418
419It is not the purpose of this section to induce you to infringe any
420patents or other property right claims or to contest validity of any
421such claims; this section has the sole purpose of protecting the
422integrity of the free software distribution system which is
423implemented by public license practices. Many people have made
424generous contributions to the wide range of software distributed
425through that system in reliance on consistent application of that
426system; it is up to the author/donor to decide if he or she is willing
427to distribute software through any other system and a licensee cannot
428impose that choice.
429
430This section is intended to make thoroughly clear what is believed to
431be a consequence of the rest of this License.
432
433 12. If the distribution and/or use of the Library is restricted in
434certain countries either by patents or by copyrighted interfaces, the
435original copyright holder who places the Library under this License may add
436an explicit geographical distribution limitation excluding those countries,
437so that distribution is permitted only in or among countries not thus
438excluded. In such case, this License incorporates the limitation as if
439written in the body of this License.
440
441 13. The Free Software Foundation may publish revised and/or new
442versions of the Library General Public License from time to time.
443Such new versions will be similar in spirit to the present version,
444but may differ in detail to address new problems or concerns.
445
446Each version is given a distinguishing version number. If the Library
447specifies a version number of this License which applies to it and
448"any later version", you have the option of following the terms and
449conditions either of that version or of any later version published by
450the Free Software Foundation. If the Library does not specify a
451license version number, you may choose any version ever published by
452the Free Software Foundation.
453
454 14. If you wish to incorporate parts of the Library into other free
455programs whose distribution conditions are incompatible with these,
456write to the author to ask for permission. For software which is
457copyrighted by the Free Software Foundation, write to the Free
458Software Foundation; we sometimes make exceptions for this. Our
459decision will be guided by the two goals of preserving the free status
460of all derivatives of our free software and of promoting the sharing
461and reuse of software generally.
462
463 NO WARRANTY
464
465 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
466WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
467EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
468OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
469KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
470IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
471PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
472LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
473THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
474
475 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
476WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
477AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
478FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
479CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
480LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
481RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
482FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
483SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
484DAMAGES.
485
486 END OF TERMS AND CONDITIONS
487
488 Appendix: How to Apply These Terms to Your New Libraries
489
490 If you develop a new library, and you want it to be of the greatest
491possible use to the public, we recommend making it free software that
492everyone can redistribute and change. You can do so by permitting
493redistribution under these terms (or, alternatively, under the terms of the
494ordinary General Public License).
495
496 To apply these terms, attach the following notices to the library. It is
497safest to attach them to the start of each source file to most effectively
498convey the exclusion of warranty; and each file should have at least the
499"copyright" line and a pointer to where the full notice is found.
500
501 <one line to give the library's name and a brief idea of what it does.>
502 Copyright (C) <year> <name of author>
503
504 This library is free software; you can redistribute it and/or
505 modify it under the terms of the GNU Library General Public
506 License as published by the Free Software Foundation; either
507 version 2 of the License, or (at your option) any later version.
508
509 This library is distributed in the hope that it will be useful,
510 but WITHOUT ANY WARRANTY; without even the implied warranty of
511 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
512 Library General Public License for more details.
513
514 You should have received a copy of the GNU Library General Public
515 License along with this library; if not, write to the Free
516 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
517
518Also add information on how to contact you by electronic and paper mail.
519
520You should also get your employer (if you work as a programmer) or your
521school, if any, to sign a "copyright disclaimer" for the library, if
522necessary. Here is a sample; alter the names:
523
524 Yoyodyne, Inc., hereby disclaims all copyright interest in the
525 library `Frob' (a library for tweaking knobs) written by James Random Hacker.
526
527 <signature of Ty Coon>, 1 April 1990
528 Ty Coon, President of Vice
529
530That's all there is to it!