Imported Upstream version 0.63.0
[hcoop/debian/courier-authlib.git] / libltdl / COPYING.LIB
CommitLineData
d9898ee8 1
2 GNU LESSER GENERAL PUBLIC LICENSE
3 Version 2.1, February 1999
4
5 Copyright (C) 1991, 1999 Free Software Foundation, Inc.
6 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
7 Everyone is permitted to copy and distribute verbatim copies
8 of this license document, but changing it is not allowed.
9
10[This is the first released version of the Lesser GPL. It also counts
11 as the successor of the GNU Library Public License, version 2, hence
12 the version number 2.1.]
13
14 Preamble
15
16 The licenses for most software are designed to take away your
17freedom to share and change it. By contrast, the GNU General Public
18Licenses are intended to guarantee your freedom to share and change
19free software--to make sure the software is free for all its users.
20
21 This license, the Lesser General Public License, applies to some
22specially designated software packages--typically libraries--of the
23Free Software Foundation and other authors who decide to use it. You
24can use it too, but we suggest you first think carefully about whether
25this license or the ordinary General Public License is the better
26strategy to use in any particular case, based on the explanations
27below.
28
29 When we speak of free software, we are referring to freedom of use,
30not price. Our General Public Licenses are designed to make sure that
31you have the freedom to distribute copies of free software (and charge
32for this service if you wish); that you receive source code or can get
33it if you want it; that you can change the software and use pieces of
34it in new free programs; and that you are informed that you can do
35these things.
36
37 To protect your rights, we need to make restrictions that forbid
38distributors to deny you these rights or to ask you to surrender these
39rights. These restrictions translate to certain responsibilities for
40you if you distribute copies of the library or if you modify it.
41
42 For example, if you distribute copies of the library, whether gratis
43or for a fee, you must give the recipients all the rights that we gave
44you. You must make sure that they, too, receive or can get the source
45code. If you link other code with the library, you must provide
46complete object files to the recipients, so that they can relink them
47with the library after making changes to the library and recompiling
48it. And you must show them these terms so they know their rights.
49
50 We protect your rights with a two-step method: (1) we copyright the
51library, and (2) we offer you this license, which gives you legal
52permission to copy, distribute and/or modify the library.
53
54 To protect each distributor, we want to make it very clear that
55there is no warranty for the free library. Also, if the library is
56modified by someone else and passed on, the recipients should know
57that what they have is not the original version, so that the original
58author's reputation will not be affected by problems that might be
59introduced by others.
60^L
61 Finally, software patents pose a constant threat to the existence of
62any free program. We wish to make sure that a company cannot
63effectively restrict the users of a free program by obtaining a
64restrictive license from a patent holder. Therefore, we insist that
65any patent license obtained for a version of the library must be
66consistent with the full freedom of use specified in this license.
67
68 Most GNU software, including some libraries, is covered by the
69ordinary GNU General Public License. This license, the GNU Lesser
70General Public License, applies to certain designated libraries, and
71is quite different from the ordinary General Public License. We use
72this license for certain libraries in order to permit linking those
73libraries into non-free programs.
74
75 When a program is linked with a library, whether statically or using
76a shared library, the combination of the two is legally speaking a
77combined work, a derivative of the original library. The ordinary
78General Public License therefore permits such linking only if the
79entire combination fits its criteria of freedom. The Lesser General
80Public License permits more lax criteria for linking other code with
81the library.
82
83 We call this license the "Lesser" General Public License because it
84does Less to protect the user's freedom than the ordinary General
85Public License. It also provides other free software developers Less
86of an advantage over competing non-free programs. These disadvantages
87are the reason we use the ordinary General Public License for many
88libraries. However, the Lesser license provides advantages in certain
89special circumstances.
90
91 For example, on rare occasions, there may be a special need to
92encourage the widest possible use of a certain library, so that it
93becomes
94a de-facto standard. To achieve this, non-free programs must be
95allowed to use the library. A more frequent case is that a free
96library does the same job as widely used non-free libraries. In this
97case, there is little to gain by limiting the free library to free
98software only, so we use the Lesser General Public License.
99
100 In other cases, permission to use a particular library in non-free
101programs enables a greater number of people to use a large body of
102free software. For example, permission to use the GNU C Library in
103non-free programs enables many more people to use the whole GNU
104operating system, as well as its variant, the GNU/Linux operating
105system.
106
107 Although the Lesser General Public License is Less protective of the
108users' freedom, it does ensure that the user of a program that is
109linked with the Library has the freedom and the wherewithal to run
110that program using a modified version of the Library.
111
112 The precise terms and conditions for copying, distribution and
113modification follow. Pay close attention to the difference between a
114"work based on the library" and a "work that uses the library". The
115former contains code derived from the library, whereas the latter must
116be combined with the library in order to run.
117^L
118 GNU LESSER GENERAL PUBLIC LICENSE
119 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
120
121 0. This License Agreement applies to any software library or other
122program which contains a notice placed by the copyright holder or
123other authorized party saying it may be distributed under the terms of
124this Lesser General Public License (also called "this License").
125Each licensee is addressed as "you".
126
127 A "library" means a collection of software functions and/or data
128prepared so as to be conveniently linked with application programs
129(which use some of those functions and data) to form executables.
130
131 The "Library", below, refers to any such software library or work
132which has been distributed under these terms. A "work based on the
133Library" means either the Library or any derivative work under
134copyright law: that is to say, a work containing the Library or a
135portion of it, either verbatim or with modifications and/or translated
136straightforwardly into another language. (Hereinafter, translation is
137included without limitation in the term "modification".)
138
139 "Source code" for a work means the preferred form of the work for
140making modifications to it. For a library, complete source code means
141all the source code for all modules it contains, plus any associated
142interface definition files, plus the scripts used to control
143compilation
144and installation of the library.
145
146 Activities other than copying, distribution and modification are not
147covered by this License; they are outside its scope. The act of
148running a program using the Library is not restricted, and output from
149such a program is covered only if its contents constitute a work based
150on the Library (independent of the use of the Library in a tool for
151writing it). Whether that is true depends on what the Library does
152and what the program that uses the Library does.
153
154 1. You may copy and distribute verbatim copies of the Library's
155complete source code as you receive it, in any medium, provided that
156you conspicuously and appropriately publish on each copy an
157appropriate copyright notice and disclaimer of warranty; keep intact
158all the notices that refer to this License and to the absence of any
159warranty; and distribute a copy of this License along with the
160Library.
161
162 You may charge a fee for the physical act of transferring a copy,
163and you may at your option offer warranty protection in exchange for a
164fee.
165\f
166 2. You may modify your copy or copies of the Library or any portion
167of it, thus forming a work based on the Library, and copy and
168distribute such modifications or work under the terms of Section 1
169above, provided that you also meet all of these conditions:
170
171 a) The modified work must itself be a software library.
172
173 b) You must cause the files modified to carry prominent notices
174 stating that you changed the files and the date of any change.
175
176 c) You must cause the whole of the work to be licensed at no
177 charge to all third parties under the terms of this License.
178
179 d) If a facility in the modified Library refers to a function or a
180 table of data to be supplied by an application program that uses
181 the facility, other than as an argument passed when the facility
182 is invoked, then you must make a good faith effort to ensure that,
183 in the event an application does not supply such function or
184 table, the facility still operates, and performs whatever part of
185 its purpose remains meaningful.
186
187 (For example, a function in a library to compute square roots has
188 a purpose that is entirely well-defined independent of the
189 application. Therefore, Subsection 2d requires that any
190 application-supplied function or table used by this function must
191 be optional: if the application does not supply it, the square
192 root function must still compute square roots.)
193
194These requirements apply to the modified work as a whole. If
195identifiable sections of that work are not derived from the Library,
196and can be reasonably considered independent and separate works in
197themselves, then this License, and its terms, do not apply to those
198sections when you distribute them as separate works. But when you
199distribute the same sections as part of a whole which is a work based
200on the Library, the distribution of the whole must be on the terms of
201this License, whose permissions for other licensees extend to the
202entire whole, and thus to each and every part regardless of who wrote
203it.
204
205Thus, it is not the intent of this section to claim rights or contest
206your rights to work written entirely by you; rather, the intent is to
207exercise the right to control the distribution of derivative or
208collective works based on the Library.
209
210In addition, mere aggregation of another work not based on the Library
211with the Library (or with a work based on the Library) on a volume of
212a storage or distribution medium does not bring the other work under
213the scope of this License.
214
215 3. You may opt to apply the terms of the ordinary GNU General Public
216License instead of this License to a given copy of the Library. To do
217this, you must alter all the notices that refer to this License, so
218that they refer to the ordinary GNU General Public License, version 2,
219instead of to this License. (If a newer version than version 2 of the
220ordinary GNU General Public License has appeared, then you can specify
221that version instead if you wish.) Do not make any other change in
222these notices.
223^L
224 Once this change is made in a given copy, it is irreversible for
225that copy, so the ordinary GNU General Public License applies to all
226subsequent copies and derivative works made from that copy.
227
228 This option is useful when you wish to copy part of the code of
229the Library into a program that is not a library.
230
231 4. You may copy and distribute the Library (or a portion or
232derivative of it, under Section 2) in object code or executable form
233under the terms of Sections 1 and 2 above provided that you accompany
234it with the complete corresponding machine-readable source code, which
235must be distributed under the terms of Sections 1 and 2 above on a
236medium customarily used for software interchange.
237
238 If distribution of object code is made by offering access to copy
239from a designated place, then offering equivalent access to copy the
240source code from the same place satisfies the requirement to
241distribute the source code, even though third parties are not
242compelled to copy the source along with the object code.
243
244 5. A program that contains no derivative of any portion of the
245Library, but is designed to work with the Library by being compiled or
246linked with it, is called a "work that uses the Library". Such a
247work, in isolation, is not a derivative work of the Library, and
248therefore falls outside the scope of this License.
249
250 However, linking a "work that uses the Library" with the Library
251creates an executable that is a derivative of the Library (because it
252contains portions of the Library), rather than a "work that uses the
253library". The executable is therefore covered by this License.
254Section 6 states terms for distribution of such executables.
255
256 When a "work that uses the Library" uses material from a header file
257that is part of the Library, the object code for the work may be a
258derivative work of the Library even though the source code is not.
259Whether this is true is especially significant if the work can be
260linked without the Library, or if the work is itself a library. The
261threshold for this to be true is not precisely defined by law.
262
263 If such an object file uses only numerical parameters, data
264structure layouts and accessors, and small macros and small inline
265functions (ten lines or less in length), then the use of the object
266file is unrestricted, regardless of whether it is legally a derivative
267work. (Executables containing this object code plus portions of the
268Library will still fall under Section 6.)
269
270 Otherwise, if the work is a derivative of the Library, you may
271distribute the object code for the work under the terms of Section 6.
272Any executables containing that work also fall under Section 6,
273whether or not they are linked directly with the Library itself.
274^L
275 6. As an exception to the Sections above, you may also combine or
276link a "work that uses the Library" with the Library to produce a
277work containing portions of the Library, and distribute that work
278under terms of your choice, provided that the terms permit
279modification of the work for the customer's own use and reverse
280engineering for debugging such modifications.
281
282 You must give prominent notice with each copy of the work that the
283Library is used in it and that the Library and its use are covered by
284this License. You must supply a copy of this License. If the work
285during execution displays copyright notices, you must include the
286copyright notice for the Library among them, as well as a reference
287directing the user to the copy of this License. Also, you must do one
288of these things:
289
290 a) Accompany the work with the complete corresponding
291 machine-readable source code for the Library including whatever
292 changes were used in the work (which must be distributed under
293 Sections 1 and 2 above); and, if the work is an executable linked
294 with the Library, with the complete machine-readable "work that
295 uses the Library", as object code and/or source code, so that the
296 user can modify the Library and then relink to produce a modified
297 executable containing the modified Library. (It is understood
298 that the user who changes the contents of definitions files in the
299 Library will not necessarily be able to recompile the application
300 to use the modified definitions.)
301
302 b) Use a suitable shared library mechanism for linking with the
303 Library. A suitable mechanism is one that (1) uses at run time a
304 copy of the library already present on the user's computer system,
305 rather than copying library functions into the executable, and (2)
306 will operate properly with a modified version of the library, if
307 the user installs one, as long as the modified version is
308 interface-compatible with the version that the work was made with.
309
310 c) Accompany the work with a written offer, valid for at
311 least three years, to give the same user the materials
312 specified in Subsection 6a, above, for a charge no more
313 than the cost of performing this distribution.
314
315 d) If distribution of the work is made by offering access to copy
316 from a designated place, offer equivalent access to copy the above
317 specified materials from the same place.
318
319 e) Verify that the user has already received a copy of these
320 materials or that you have already sent this user a copy.
321
322 For an executable, the required form of the "work that uses the
323Library" must include any data and utility programs needed for
324reproducing the executable from it. However, as a special exception,
325the materials to be distributed need not include anything that is
326normally distributed (in either source or binary form) with the major
327components (compiler, kernel, and so on) of the operating system on
328which the executable runs, unless that component itself accompanies
329the executable.
330
331 It may happen that this requirement contradicts the license
332restrictions of other proprietary libraries that do not normally
333accompany the operating system. Such a contradiction means you cannot
334use both them and the Library together in an executable that you
335distribute.
336^L
337 7. You may place library facilities that are a work based on the
338Library side-by-side in a single library together with other library
339facilities not covered by this License, and distribute such a combined
340library, provided that the separate distribution of the work based on
341the Library and of the other library facilities is otherwise
342permitted, and provided that you do these two things:
343
344 a) Accompany the combined library with a copy of the same work
345 based on the Library, uncombined with any other library
346 facilities. This must be distributed under the terms of the
347 Sections above.
348
349 b) Give prominent notice with the combined library of the fact
350 that part of it is a work based on the Library, and explaining
351 where to find the accompanying uncombined form of the same work.
352
353 8. You may not copy, modify, sublicense, link with, or distribute
354the Library except as expressly provided under this License. Any
355attempt otherwise to copy, modify, sublicense, link with, or
356distribute the Library is void, and will automatically terminate your
357rights under this License. However, parties who have received copies,
358or rights, from you under this License will not have their licenses
359terminated so long as such parties remain in full compliance.
360
361 9. You are not required to accept this License, since you have not
362signed it. However, nothing else grants you permission to modify or
363distribute the Library or its derivative works. These actions are
364prohibited by law if you do not accept this License. Therefore, by
365modifying or distributing the Library (or any work based on the
366Library), you indicate your acceptance of this License to do so, and
367all its terms and conditions for copying, distributing or modifying
368the Library or works based on it.
369
370 10. Each time you redistribute the Library (or any work based on the
371Library), the recipient automatically receives a license from the
372original licensor to copy, distribute, link with or modify the Library
373subject to these terms and conditions. You may not impose any further
374restrictions on the recipients' exercise of the rights granted herein.
375You are not responsible for enforcing compliance by third parties with
376this License.
377^L
378 11. If, as a consequence of a court judgment or allegation of patent
379infringement or for any other reason (not limited to patent issues),
380conditions are imposed on you (whether by court order, agreement or
381otherwise) that contradict the conditions of this License, they do not
382excuse you from the conditions of this License. If you cannot
383distribute so as to satisfy simultaneously your obligations under this
384License and any other pertinent obligations, then as a consequence you
385may not distribute the Library at all. For example, if a patent
386license would not permit royalty-free redistribution of the Library by
387all those who receive copies directly or indirectly through you, then
388the only way you could satisfy both it and this License would be to
389refrain entirely from distribution of the Library.
390
391If any portion of this section is held invalid or unenforceable under
392any particular circumstance, the balance of the section is intended to
393apply, and the section as a whole is intended to apply in other
394circumstances.
395
396It is not the purpose of this section to induce you to infringe any
397patents or other property right claims or to contest validity of any
398such claims; this section has the sole purpose of protecting the
399integrity of the free software distribution system which is
400implemented by public license practices. Many people have made
401generous contributions to the wide range of software distributed
402through that system in reliance on consistent application of that
403system; it is up to the author/donor to decide if he or she is willing
404to distribute software through any other system and a licensee cannot
405impose that choice.
406
407This section is intended to make thoroughly clear what is believed to
408be a consequence of the rest of this License.
409
410 12. If the distribution and/or use of the Library is restricted in
411certain countries either by patents or by copyrighted interfaces, the
412original copyright holder who places the Library under this License
413may add an explicit geographical distribution limitation excluding those
414countries, so that distribution is permitted only in or among
415countries not thus excluded. In such case, this License incorporates
416the limitation as if written in the body of this License.
417
418 13. The Free Software Foundation may publish revised and/or new
419versions of the Lesser General Public License from time to time.
420Such new versions will be similar in spirit to the present version,
421but may differ in detail to address new problems or concerns.
422
423Each version is given a distinguishing version number. If the Library
424specifies a version number of this License which applies to it and
425"any later version", you have the option of following the terms and
426conditions either of that version or of any later version published by
427the Free Software Foundation. If the Library does not specify a
428license version number, you may choose any version ever published by
429the Free Software Foundation.
430^L
431 14. If you wish to incorporate parts of the Library into other free
432programs whose distribution conditions are incompatible with these,
433write to the author to ask for permission. For software which is
434copyrighted by the Free Software Foundation, write to the Free
435Software Foundation; we sometimes make exceptions for this. Our
436decision will be guided by the two goals of preserving the free status
437of all derivatives of our free software and of promoting the sharing
438and reuse of software generally.
439
440 NO WARRANTY
441
442 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
443WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
444EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
445OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
446KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
447IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
448PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
449LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
450THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
451
452 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
453WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
454AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
455FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
456CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
457LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
458RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
459FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
460SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
461DAMAGES.
462
463 END OF TERMS AND CONDITIONS
464^L
465 How to Apply These Terms to Your New Libraries
466
467 If you develop a new library, and you want it to be of the greatest
468possible use to the public, we recommend making it free software that
469everyone can redistribute and change. You can do so by permitting
470redistribution under these terms (or, alternatively, under the terms
471of the ordinary General Public License).
472
473 To apply these terms, attach the following notices to the library.
474It is safest to attach them to the start of each source file to most
475effectively convey the exclusion of warranty; and each file should
476have at least the "copyright" line and a pointer to where the full
477notice is found.
478
479
480 <one line to give the library's name and a brief idea of what it
481does.>
482 Copyright (C) <year> <name of author>
483
484 This library is free software; you can redistribute it and/or
485 modify it under the terms of the GNU Lesser General Public
486 License as published by the Free Software Foundation; either
487 version 2 of the License, or (at your option) any later version.
488
489 This library is distributed in the hope that it will be useful,
490 but WITHOUT ANY WARRANTY; without even the implied warranty of
491 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
492 Lesser General Public License for more details.
493
494 You should have received a copy of the GNU Lesser General Public
495 License along with this library; if not, write to the Free Software
496 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
497
498Also add information on how to contact you by electronic and paper
499mail.
500
501You should also get your employer (if you work as a programmer) or
502your
503school, if any, to sign a "copyright disclaimer" for the library, if
504necessary. Here is a sample; alter the names:
505
506 Yoyodyne, Inc., hereby disclaims all copyright interest in the
507 library `Frob' (a library for tweaking knobs) written by James
508Random Hacker.
509
510 <signature of Ty Coon>, 1 April 1990
511 Ty Coon, President of Vice
512
513That's all there is to it!
514
515