xref: /openbmc/linux/LICENSES/preferred/LGPL-2.0 (revision addee42a)
1Valid-License-Identifier: LGPL-2.0
2Valid-License-Identifier: LGPL-2.0+
3SPDX-URL: https://spdx.org/licenses/LGPL-2.0.html
4Usage-Guide:
5  To use this license in source code, put one of the following SPDX
6  tag/value pairs into a comment according to the placement
7  guidelines in the licensing rules documentation.
8  For 'GNU Library General Public License (LGPL) version 2.0 only' use:
9    SPDX-License-Identifier: LGPL-2.0
10  For 'GNU Library General Public License (LGPL) version 2.0 or any later
11  version' use:
12    SPDX-License-Identifier: LGPL-2.0+
13License-Text:
14
15GNU LIBRARY GENERAL PUBLIC LICENSE
16Version 2, June 1991
17
18Copyright (C) 1991 Free Software Foundation, Inc.
1951 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20
21Everyone is permitted to copy and distribute verbatim copies of this
22license document, but changing it is not allowed.
23
24[This is the first released version of the library GPL. It is numbered 2
25because it goes with version 2 of the ordinary GPL.]
26
27Preamble
28
29The licenses for most software are designed to take away your freedom to
30share and change it. By contrast, the GNU General Public Licenses are
31intended to guarantee your freedom to share and change free software--to
32make sure the software is free for all its users.
33
34This license, the Library General Public License, applies to some specially
35designated Free Software Foundation software, and to any other libraries
36whose authors decide to use it. You can use it for your libraries, too.
37
38When we speak of free software, we are referring to freedom, not price. Our
39General Public Licenses are designed to make sure that you have the freedom
40to distribute copies of free software (and charge for this service if you
41wish), that you receive source code or can get it if you want it, that you
42can change the software or use pieces of it in new free programs; and that
43you know you can do these things.
44
45To protect your rights, we need to make restrictions that forbid anyone to
46deny you these rights or to ask you to surrender the rights. These
47restrictions translate to certain responsibilities for you if you
48distribute copies of the library, or if you modify it.
49
50For example, if you distribute copies of the library, whether gratis or for
51a fee, you must give the recipients all the rights that we gave you. You
52must make sure that they, too, receive or can get the source code. If you
53link a program with the library, you must provide complete object files to
54the recipients so that they can relink them with the library, after making
55changes to the library and recompiling it. And you must show them these
56terms so they know their rights.
57
58Our method of protecting your rights has two steps: (1) copyright the
59library, and (2) offer you this license which gives you legal permission to
60copy, distribute and/or modify the library.
61
62Also, for each distributor's protection, we want to make certain that
63everyone understands that there is no warranty for this free library. If
64the library is modified by someone else and passed on, we want its
65recipients to know that what they have is not the original version, so that
66any problems introduced by others will not reflect on the original authors'
67reputations.
68
69Finally, any free program is threatened constantly by software patents. We
70wish to avoid the danger that companies distributing free software will
71individually obtain patent licenses, thus in effect transforming the
72program into proprietary software. To prevent this, we have made it clear
73that any patent must be licensed for everyone's free use or not licensed at
74all.
75
76Most GNU software, including some libraries, is covered by the ordinary GNU
77General Public License, which was designed for utility programs. This
78license, the GNU Library General Public License, applies to certain
79designated libraries. This license is quite different from the ordinary
80one; be sure to read it in full, and don't assume that anything in it is
81the same as in the ordinary license.
82
83The reason we have a separate public license for some libraries is that
84they blur the distinction we usually make between modifying or adding to a
85program and simply using it. Linking a program with a library, without
86changing the library, is in some sense simply using the library, and is
87analogous to running a utility program or application program. However, in
88a textual and legal sense, the linked executable is a combined work, a
89derivative of the original library, and the ordinary General Public License
90treats it as such.
91
92Because of this blurred distinction, using the ordinary General Public
93License for libraries did not effectively promote software sharing, because
94most developers did not use the libraries. We concluded that weaker
95conditions might promote sharing better.
96
97However, unrestricted linking of non-free programs would deprive the users
98of those programs of all benefit from the free status of the libraries
99themselves. This Library General Public License is intended to permit
100developers of non-free programs to use free libraries, while preserving
101your freedom as a user of such programs to change the free libraries that
102are incorporated in them. (We have not seen how to achieve this as regards
103changes in header files, but we have achieved it as regards changes in the
104actual functions of the Library.) The hope is that this will lead to faster
105development of free libraries.
106
107The precise terms and conditions for copying, distribution and modification
108follow. Pay close attention to the difference between a "work based on the
109library" and a "work that uses the library". The former contains code
110derived from the library, while the latter only works together with the
111library.
112
113Note that it is possible for a library to be covered by the ordinary
114General Public License rather than by this special one.
115
116TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
117
1180. This License Agreement applies to any software library which contains a
119   notice placed by the copyright holder or other authorized party saying
120   it may be distributed under the terms of this Library General Public
121   License (also called "this License"). Each licensee is addressed as
122   "you".
123
124   A "library" means a collection of software functions and/or data
125   prepared so as to be conveniently linked with application programs
126   (which use some of those functions and data) to form executables.
127
128   The "Library", below, refers to any such software library or work which
129   has been distributed under these terms. A "work based on the Library"
130   means either the Library or any derivative work under copyright law:
131   that is to say, a work containing the Library or a portion of it, either
132   verbatim or with modifications and/or translated straightforwardly into
133   another language. (Hereinafter, translation is included without
134   limitation in the term "modification".)
135
136   "Source code" for a work means the preferred form of the work for making
137   modifications to it. For a library, complete source code means all the
138   source code for all modules it contains, plus any associated interface
139   definition files, plus the scripts used to control compilation and
140   installation of the library.
141
142   Activities other than copying, distribution and modification are not
143   covered by this License; they are outside its scope. The act of running
144   a program using the Library is not restricted, and output from such a
145   program is covered only if its contents constitute a work based on the
146   Library (independent of the use of the Library in a tool for writing
147   it). Whether that is true depends on what the Library does and what the
148   program that uses the Library does.
149
1501. You may copy and distribute verbatim copies of the Library's complete
151   source code as you receive it, in any medium, provided that you
152   conspicuously and appropriately publish on each copy an appropriate
153   copyright notice and disclaimer of warranty; keep intact all the notices
154   that refer to this License and to the absence of any warranty; and
155   distribute a copy of this License along with the Library.
156
157   You may charge a fee for the physical act of transferring a copy, and
158   you may at your option offer warranty protection in exchange for a fee.
159
1602. You may modify your copy or copies of the Library or any portion of it,
161   thus forming a work based on the Library, and copy and distribute such
162   modifications or work under the terms of Section 1 above, provided that
163   you also meet all of these conditions:
164
165   a) The modified work must itself be a software library.
166
167   b) You must cause the files modified to carry prominent notices stating
168      that you changed the files and the date of any change.
169
170   c) You must cause the whole of the work to be licensed at no charge to
171      all third parties under the terms of this License.
172
173   d) If a facility in the modified Library refers to a function or a table
174      of data to be supplied by an application program that uses the
175      facility, other than as an argument passed when the facility is
176      invoked, then you must make a good faith effort to ensure that, in
177      the event an application does not supply such function or table, the
178      facility still operates, and performs whatever part of its purpose
179      remains meaningful.
180
181   (For example, a function in a library to compute square roots has a
182   purpose that is entirely well-defined independent of the
183   application. Therefore, Subsection 2d requires that any
184   application-supplied function or table used by this function must be
185   optional: if the application does not supply it, the square root
186   function must still compute square roots.)
187
188   These requirements apply to the modified work as a whole. If
189   identifiable sections of that work are not derived from the Library, and
190   can be reasonably considered independent and separate works in
191   themselves, then this License, and its terms, do not apply to those
192   sections when you distribute them as separate works. But when you
193   distribute the same sections as part of a whole which is a work based on
194   the Library, the distribution of the whole must be on the terms of this
195   License, whose permissions for other licensees extend to the entire
196   whole, and thus to each and every part regardless of who wrote it.
197
198   Thus, it is not the intent of this section to claim rights or contest
199   your rights to work written entirely by you; rather, the intent is to
200   exercise the right to control the distribution of derivative or
201   collective works based on the Library.
202
203   In addition, mere aggregation of another work not based on the Library
204   with the Library (or with a work based on the Library) on a volume of a
205   storage or distribution medium does not bring the other work under the
206   scope of this License.
207
2083. You may opt to apply the terms of the ordinary GNU General Public
209   License instead of this License to a given copy of the Library. To do
210   this, you must alter all the notices that refer to this License, so that
211   they refer to the ordinary GNU General Public License, version 2,
212   instead of to this License. (If a newer version than version 2 of the
213   ordinary GNU General Public License has appeared, then you can specify
214   that version instead if you wish.) Do not make any other change in these
215   notices.
216
217   Once this change is made in a given copy, it is irreversible for that
218   copy, so the ordinary GNU General Public License applies to all
219   subsequent copies and derivative works made from that copy.
220
221   This option is useful when you wish to copy part of the code of the
222   Library into a program that is not a library.
223
2244. You may copy and distribute the Library (or a portion or derivative of
225   it, under Section 2) in object code or executable form under the terms
226   of Sections 1 and 2 above provided that you accompany it with the
227   complete corresponding machine-readable source code, which must be
228   distributed under the terms of Sections 1 and 2 above on a medium
229   customarily used for software interchange.
230
231   If distribution of object code is made by offering access to copy from a
232   designated place, then offering equivalent access to copy the source
233   code from the same place satisfies the requirement to distribute the
234   source code, even though third parties are not compelled to copy the
235   source along with the object code.
236
2375. A program that contains no derivative of any portion of the Library, but
238   is designed to work with the Library by being compiled or linked with
239   it, is called a "work that uses the Library". Such a work, in isolation,
240   is not a derivative work of the Library, and therefore falls outside the
241   scope of this License.
242
243   However, linking a "work that uses the Library" with the Library creates
244   an executable that is a derivative of the Library (because it contains
245   portions of the Library), rather than a "work that uses the
246   library". The executable is therefore covered by this License. Section 6
247   states terms for distribution of such executables.
248
249   When a "work that uses the Library" uses material from a header file
250   that is part of the Library, the object code for the work may be a
251   derivative work of the Library even though the source code is
252   not. Whether this is true is especially significant if the work can be
253   linked without the Library, or if the work is itself a library. The
254   threshold for this to be true is not precisely defined by law.
255
256   If such an object file uses only numerical parameters, data structure
257   layouts and accessors, and small macros and small inline functions (ten
258   lines or less in length), then the use of the object file is
259   unrestricted, regardless of whether it is legally a derivative
260   work. (Executables containing this object code plus portions of the
261   Library will still fall under Section 6.)
262
263   Otherwise, if the work is a derivative of the Library, you may
264   distribute the object code for the work under the terms of Section
265   6. Any executables containing that work also fall under Section 6,
266   whether or not they are linked directly with the Library itself.
267
2686. As an exception to the Sections above, you may also compile or link a
269   "work that uses the Library" with the Library to produce a work
270   containing portions of the Library, and distribute that work under terms
271   of your choice, provided that the terms permit modification of the work
272   for the customer's own use and reverse engineering for debugging such
273   modifications.
274
275   You must give prominent notice with each copy of the work that the
276   Library is used in it and that the Library and its use are covered by
277   this License. You must supply a copy of this License. If the work during
278   execution displays copyright notices, you must include the copyright
279   notice for the Library among them, as well as a reference directing the
280   user to the copy of this License. Also, you must do one of these things:
281
282   a) Accompany the work with the complete corresponding machine-readable
283      source code for the Library including whatever changes were used in
284      the work (which must be distributed under Sections 1 and 2 above);
285      and, if the work is an executable linked with the Library, with the
286      complete machine-readable "work that uses the Library", as object
287      code and/or source code, so that the user can modify the Library and
288      then relink to produce a modified executable containing the modified
289      Library. (It is understood that the user who changes the contents of
290      definitions files in the Library will not necessarily be able to
291      recompile the application to use the modified definitions.)
292
293   b) Accompany the work with a written offer, valid for at least three
294      years, to give the same user the materials specified in Subsection
295      6a, above, for a charge no more than the cost of performing this
296      distribution.
297
298   c) If distribution of the work is made by offering access to copy from a
299      designated place, offer equivalent access to copy the above specified
300      materials from the same place.
301
302   d) Verify that the user has already received a copy of these materials
303      or that you have already sent this user a copy.
304
305   For an executable, the required form of the "work that uses the Library"
306   must include any data and utility programs needed for reproducing the
307   executable from it. However, as a special exception, the source code
308   distributed need not include anything that is normally distributed (in
309   either source or binary form) with the major components (compiler,
310   kernel, and so on) of the operating system on which the executable runs,
311   unless that component itself accompanies the executable.
312
313   It may happen that this requirement contradicts the license restrictions
314   of other proprietary libraries that do not normally accompany the
315   operating system. Such a contradiction means you cannot use both them
316   and the Library together in an executable that you distribute.
317
3187. You may place library facilities that are a work based on the Library
319   side-by-side in a single library together with other library facilities
320   not covered by this License, and distribute such a combined library,
321   provided that the separate distribution of the work based on the Library
322   and of the other library facilities is otherwise permitted, and provided
323   that you do these two things:
324
325   a) Accompany the combined library with a copy of the same work based on
326      the Library, uncombined with any other library facilities. This must
327      be distributed under the terms of the Sections above.
328
329   b) Give prominent notice with the combined library of the fact that part
330      of it is a work based on the Library, and explaining where to find
331      the accompanying uncombined form of the same work.
332
3338. You may not copy, modify, sublicense, link with, or distribute the
334   Library except as expressly provided under this License. Any attempt
335   otherwise to copy, modify, sublicense, link with, or distribute the
336   Library is void, and will automatically terminate your rights under this
337   License. However, parties who have received copies, or rights, from you
338   under this License will not have their licenses terminated so long as
339   such parties remain in full compliance.
340
3419. You are not required to accept this License, since you have not signed
342   it. However, nothing else grants you permission to modify or distribute
343   the Library or its derivative works. These actions are prohibited by law
344   if you do not accept this License. Therefore, by modifying or
345   distributing the Library (or any work based on the Library), you
346   indicate your acceptance of this License to do so, and all its terms and
347   conditions for copying, distributing or modifying the Library or works
348   based on it.
349
35010. Each time you redistribute the Library (or any work based on the
351    Library), the recipient automatically receives a license from the
352    original licensor to copy, distribute, link with or modify the Library
353    subject to these terms and conditions. You may not impose any further
354    restrictions on the recipients' exercise of the rights granted
355    herein. You are not responsible for enforcing compliance by third
356    parties to this License.
357
35811. If, as a consequence of a court judgment or allegation of patent
359    infringement or for any other reason (not limited to patent issues),
360    conditions are imposed on you (whether by court order, agreement or
361    otherwise) that contradict the conditions of this License, they do not
362    excuse you from the conditions of this License. If you cannot
363    distribute so as to satisfy simultaneously your obligations under this
364    License and any other pertinent obligations, then as a consequence you
365    may not distribute the Library at all. For example, if a patent license
366    would not permit royalty-free redistribution of the Library by all
367    those who receive copies directly or indirectly through you, then the
368    only way you could satisfy both it and this License would be to refrain
369    entirely from distribution of the Library.
370
371    If any portion of this section is held invalid or unenforceable under
372    any particular circumstance, the balance of the section is intended to
373    apply, and the section as a whole is intended to apply in other
374    circumstances.
375
376    It is not the purpose of this section to induce you to infringe any
377    patents or other property right claims or to contest validity of any
378    such claims; this section has the sole purpose of protecting the
379    integrity of the free software distribution system which is implemented
380    by public license practices. Many people have made generous
381    contributions to the wide range of software distributed through that
382    system in reliance on consistent application of that system; it is up
383    to the author/donor to decide if he or she is willing to distribute
384    software through any other system and a licensee cannot impose that
385    choice.
386
387    This section is intended to make thoroughly clear what is believed to
388    be a consequence of the rest of this License.
389
39012. If the distribution and/or use of the Library is restricted in certain
391    countries either by patents or by copyrighted interfaces, the original
392    copyright holder who places the Library under this License may add an
393    explicit geographical distribution limitation excluding those
394    countries, so that distribution is permitted only in or among countries
395    not thus excluded. In such case, this License incorporates the
396    limitation as if written in the body of this License.
397
39813. The Free Software Foundation may publish revised and/or new versions of
399    the Library General Public License from time to time. Such new versions
400    will be similar in spirit to the present version, but may differ in
401    detail to address new problems or concerns.
402
403    Each version is given a distinguishing version number. If the Library
404    specifies a version number of this License which applies to it and "any
405    later version", you have the option of following the terms and
406    conditions either of that version or of any later version published by
407    the Free Software Foundation. If the Library does not specify a license
408    version number, you may choose any version ever published by the Free
409    Software Foundation.
410
41114. If you wish to incorporate parts of the Library into other free
412    programs whose distribution conditions are incompatible with these,
413    write to the author to ask for permission. For software which is
414    copyrighted by the Free Software Foundation, write to the Free Software
415    Foundation; we sometimes make exceptions for this. Our decision will be
416    guided by the two goals of preserving the free status of all
417    derivatives of our free software and of promoting the sharing and reuse
418    of software generally.
419
420NO WARRANTY
421
42215. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
423    FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
424    OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
425    PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
426    EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
427    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
428    ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE LIBRARY IS WITH
429    YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
430    NECESSARY SERVICING, REPAIR OR CORRECTION.
431
43216. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
433    WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
434    REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
435    DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
436    DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE LIBRARY
437    (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
438    INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
439    THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR
440    OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
441
442END OF TERMS AND CONDITIONS
443
444How to Apply These Terms to Your New Libraries
445
446If you develop a new library, and you want it to be of the greatest
447possible use to the public, we recommend making it free software that
448everyone can redistribute and change. You can do so by permitting
449redistribution under these terms (or, alternatively, under the terms of the
450ordinary General Public License).
451
452To apply these terms, attach the following notices to the library. It is
453safest to attach them to the start of each source file to most effectively
454convey the exclusion of warranty; and each file should have at least the
455"copyright" line and a pointer to where the full notice is found.
456
457one line to give the library's name and an idea of what it does.
458Copyright (C) year name of author
459
460This library is free software; you can redistribute it and/or modify it
461under the terms of the GNU Library General Public License as published by
462the Free Software Foundation; either version 2 of the License, or (at your
463option) any later version.
464
465This library is distributed in the hope that it will be useful, but WITHOUT
466ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
467FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
468License for more details.
469
470You should have received a copy of the GNU Library General Public License
471along with this library; if not, write to the Free Software Foundation,
472Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
473
474Also add information on how to contact you by electronic and paper mail.
475
476You should also get your employer (if you work as a programmer) or your
477school, if any, to sign a "copyright disclaimer" for the library, if
478necessary. Here is a sample; alter the names:
479
480Yoyodyne, Inc., hereby disclaims all copyright interest in
481the library `Frob' (a library for tweaking knobs) written
482by James Random Hacker.
483
484signature of Ty Coon, 1 April 1990
485Ty Coon, President of Vice
486
487That's all there is to it!
488