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2The LaTeX Project Public License
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5LPPL Version 1.3c 2008-05-04
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7Copyright 1999 2002-2008 LaTeX3 Project
8 Everyone is allowed to distribute verbatim copies of this
9 license document, but modification of it is not allowed.
10
11
12PREAMBLE
13========
14
15The LaTeX Project Public License (LPPL) is the primary license under
16which the LaTeX kernel and the base LaTeX packages are distributed.
17
18You may use this license for any work of which you hold the copyright
19and which you wish to distribute. This license may be particularly
20suitable if your work is TeX-related (such as a LaTeX package), but
21it is written in such a way that you can use it even if your work is
22unrelated to TeX.
23
24The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE`,
25below, gives instructions, examples, and recommendations for authors
26who are considering distributing their works under this license.
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28This license gives conditions under which a work may be distributed
29and modified, as well as conditions under which modified versions of
30that work may be distributed.
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32We, the LaTeX3 Project, believe that the conditions below give you
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40
41DEFINITIONS
42===========
43
44In this license document the following terms are used:
45
46 `Work`
47 Any work being distributed under this License.
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49 `Derived Work`
50 Any work that under any applicable law is derived from the Work.
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52 `Modification`
53 Any procedure that produces a Derived Work under any applicable
54 law -- for example, the production of a file containing an
55 original file associated with the Work or a significant portion of
56 such a file, either verbatim or with modifications and/or
57 translated into another language.
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59 `Modify`
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63 `Distribution`
64 Making copies of the Work available from one person to another, in
65 whole or in part. Distribution includes (but is not limited to)
66 making any electronic components of the Work accessible by
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70 `Compiled Work`
71 A version of the Work that has been processed into a form where it
72 is directly usable on a computer system. This processing may
73 include using installation facilities provided by the Work,
74 transformations of the Work, copying of components of the Work, or
75 other activities. Note that modification of any installation
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78 `Current Maintainer`
79 A person or persons nominated as such within the Work. If there is
80 no such explicit nomination then it is the `Copyright Holder` under
81 any applicable law.
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83 `Base Interpreter`
84 A program or process that is normally needed for running or
85 interpreting a part or the whole of the Work.
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87 A Base Interpreter may depend on external components but these
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89 external component clearly identifies itself whenever it is used
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92 `LaTeX-Format` or in the case of files belonging to the
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95
96
97CONDITIONS ON DISTRIBUTION AND MODIFICATION
98===========================================
99
1001. Activities other than distribution and/or modification of the Work
101are not covered by this license; they are outside its scope. In
102particular, the act of running the Work is not restricted and no
103requirements are made concerning any offers of support for the Work.
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1052. You may distribute a complete, unmodified copy of the Work as you
106received it. Distribution of only part of the Work is considered
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109
1103. You may distribute a Compiled Work that has been generated from a
111complete, unmodified copy of the Work as distributed under Clause 2
112above, as long as that Compiled Work is distributed in such a way that
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114as it would have been installed if they generated a Compiled Work
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116
1174. If you are the Current Maintainer of the Work, you may, without
118restriction, modify the Work, thus creating a Derived Work. You may
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1245. If you are not the Current Maintainer of the Work, you may modify
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126and compile this Derived Work, thus creating a Compiled Work based on
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1296. If you are not the Current Maintainer of the Work, you may
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135
136 a. If a component of this Derived Work can be a direct replacement
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138 Base Interpreter, then, wherever this component of the Work
139 identifies itself to the user when used interactively with that
140 Base Interpreter, the replacement component of this Derived Work
141 clearly and unambiguously identifies itself as a modified version
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144
145 b. Every component of the Derived Work contains prominent notices
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147 prominent reference to another file that is distributed as part
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151 c. No information in the Derived Work implies that any persons,
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155 Derived Work unless those persons have stated explicitly that
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158 d. You distribute at least one of the following with the Derived Work:
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160 1. A complete, unmodified copy of the Work;
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168 2. Information that is sufficient to obtain a complete,
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1717. If you are not the Current Maintainer of the Work, you may
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1778. The conditions above are not intended to prohibit, and hence do not
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1829. Distribution of the Work or any Derived Work in an alternative
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184then produced by applying some process to that format, does not relax or
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186applying that process.
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18810. a. A Derived Work may be distributed under a different license
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193 b. If a Derived Work is distributed under a different license, that
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19811. This license places no restrictions on works that are unrelated to
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20212. Nothing in this license is intended to, or may be used to, prevent
203complete compliance by all parties with all applicable laws.
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205
206NO WARRANTY
207===========
208
209There is no warranty for the Work. Except when otherwise stated in
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217In no event unless required by applicable law or agreed to in writing
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226party has been advised of the possibility of such damages.
227
228
229MAINTENANCE OF THE WORK
230=======================
231
232The Work has the status `author-maintained` if the Copyright Holder
233explicitly and prominently states near the primary copyright notice in
234the Work that the Work can only be maintained by the Copyright Holder
235or simply that it is `author-maintained`.
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237The Work has the status `maintained` if there is a Current Maintainer
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241or act upon these error reports.
242
243The Work changes from status `maintained` to `unmaintained` if there
244is no Current Maintainer, or the person stated to be Current
245Maintainer of the work cannot be reached through the indicated means
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247significant signs of active maintenance.
248
249You can become the Current Maintainer of the Work by agreement with
250any existing Current Maintainer to take over this role.
251
252If the Work is unmaintained, you can become the Current Maintainer of
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255 1. Make a reasonable attempt to trace the Current Maintainer (and
256 the Copyright Holder, if the two differ) through the means of
257 an Internet or similar search.
258
259 2. If this search is successful, then enquire whether the Work
260 is still maintained.
261
262 a. If it is being maintained, then ask the Current Maintainer
263 to update their communication data within one month.
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265 b. If the search is unsuccessful or no action to resume active
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267 within the pertinent community your intention to take over
268 maintenance. (If the Work is a LaTeX work, this could be
269 done, for example, by posting to comp.text.tex.)
270
271 3a. If the Current Maintainer is reachable and agrees to pass
272 maintenance of the Work to you, then this takes effect
273 immediately upon announcement.
274
275 b. If the Current Maintainer is not reachable and the Copyright
276 Holder agrees that maintenance of the Work be passed to you,
277 then this takes effect immediately upon announcement.
278
279 4. If you make an `intention announcement` as described in 2b. above
280 and after three months your intention is challenged neither by
281 the Current Maintainer nor by the Copyright Holder nor by other
282 people, then you may arrange for the Work to be changed so as
283 to name you as the (new) Current Maintainer.
284
285 5. If the previously unreachable Current Maintainer becomes
286 reachable once more within three months of a change completed
287 under the terms of 3b) or 4), then that Current Maintainer must
288 become or remain the Current Maintainer upon request provided
289 they then update their communication data within one month.
290
291A change in the Current Maintainer does not, of itself, alter the fact
292that the Work is distributed under the LPPL license.
293
294If you become the Current Maintainer of the Work, you should
295immediately provide, within the Work, a prominent and unambiguous
296statement of your status as Current Maintainer. You should also
297announce your new status to the same pertinent community as
298in 2b) above.
299
300
301WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE
302======================================================
303
304This section contains important instructions, examples, and
305recommendations for authors who are considering distributing their
306works under this license. These authors are addressed as `you` in
307this section.
308
309Choosing This License or Another License
310----------------------------------------
311
312If for any part of your work you want or need to use *distribution*
313conditions that differ significantly from those in this license, then
314do not refer to this license anywhere in your work but, instead,
315distribute your work under a different license. You may use the text
316of this license as a model for your own license, but your license
317should not refer to the LPPL or otherwise give the impression that
318your work is distributed under the LPPL.
319
320The document `modguide.tex` in the base LaTeX distribution explains
321the motivation behind the conditions of this license. It explains,
322for example, why distributing LaTeX under the GNU General Public
323License (GPL) was considered inappropriate. Even if your work is
324unrelated to LaTeX, the discussion in `modguide.tex` may still be
325relevant, and authors intending to distribute their works under any
326license are encouraged to read it.
327
328A Recommendation on Modification Without Distribution
329-----------------------------------------------------
330
331It is wise never to modify a component of the Work, even for your own
332personal use, without also meeting the above conditions for
333distributing the modified component. While you might intend that such
334modifications will never be distributed, often this will happen by
335accident -- you may forget that you have modified that component; or
336it may not occur to you when allowing others to access the modified
337version that you are thus distributing it and violating the conditions
338of this license in ways that could have legal implications and, worse,
339cause problems for the community. It is therefore usually in your
340best interest to keep your copy of the Work identical with the public
341one. Many works provide ways to control the behavior of that work
342without altering any of its licensed components.
343
344How to Use This License
345-----------------------
346
347To use this license, place in each of the components of your work both
348an explicit copyright notice including your name and the year the work
349was authored and/or last substantially modified. Include also a
350statement that the distribution and/or modification of that
351component is constrained by the conditions in this license.
352
353Here is an example of such a notice and statement:
354
355 %% pig.dtx
356 %% Copyright 2005 M. Y. Name
357 %
358 % This work may be distributed and/or modified under the
359 % conditions of the LaTeX Project Public License, either version 1.3
360 % of this license or (at your option) any later version.
361 % The latest version of this license is in
362 % http://www.latex-project.org/lppl.txt
363 % and version 1.3 or later is part of all distributions of LaTeX
364 % version 2005/12/01 or later.
365 %
366 % This work has the LPPL maintenance status `maintained`.
367 %
368 % The Current Maintainer of this work is M. Y. Name.
369 %
370 % This work consists of the files pig.dtx and pig.ins
371 % and the derived file pig.sty.
372
373Given such a notice and statement in a file, the conditions
374given in this license document would apply, with the `Work` referring
375to the three files `pig.dtx`, `pig.ins`, and `pig.sty` (the last being
376generated from `pig.dtx` using `pig.ins`), the `Base Interpreter`
377referring to any `LaTeX-Format`, and both `Copyright Holder` and
378`Current Maintainer` referring to the person `M. Y. Name`.
379
380If you do not want the Maintenance section of LPPL to apply to your
381Work, change `maintained` above into `author-maintained`.
382However, we recommend that you use `maintained`, as the Maintenance
383section was added in order to ensure that your Work remains useful to
384the community even when you can no longer maintain and support it
385yourself.
386
387Derived Works That Are Not Replacements
388---------------------------------------
389
390Several clauses of the LPPL specify means to provide reliability and
391stability for the user community. They therefore concern themselves
392with the case that a Derived Work is intended to be used as a
393(compatible or incompatible) replacement of the original Work. If
394this is not the case (e.g., if a few lines of code are reused for a
395completely different task), then clauses 6b and 6d shall not apply.
396
397
398Important Recommendations
399-------------------------
400
401 Defining What Constitutes the Work
402
403 The LPPL requires that distributions of the Work contain all the
404 files of the Work. It is therefore important that you provide a
405 way for the licensee to determine which files constitute the Work.
406 This could, for example, be achieved by explicitly listing all the
407 files of the Work near the copyright notice of each file or by
408 using a line such as:
409
410 % This work consists of all files listed in manifest.txt.
411
412 in that place. In the absence of an unequivocal list it might be
413 impossible for the licensee to determine what is considered by you
414 to comprise the Work and, in such a case, the licensee would be
415 entitled to make reasonable conjectures as to which files comprise
416 the Work.
417
418