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1 The LaTeX Project Public License
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4 LPPL Version 1.3c 2008-05-04
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6 Copyright 1999 2002-2008 LaTeX3 Project
7 Everyone is allowed to distribute verbatim copies of this
8 license document, but modification of it is not allowed.
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10
11 PREAMBLE
12 ========
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14 The LaTeX Project Public License (LPPL) is the primary license under
15 which the LaTeX kernel and the base LaTeX packages are distributed.
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17 You may use this license for any work of which you hold the copyright
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23 The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE',
24 below, gives instructions, examples, and recommendations for authors
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40 DEFINITIONS
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43 In this license document the following terms are used:
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45 `Work'
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51 `Modification'
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96 CONDITIONS ON DISTRIBUTION AND MODIFICATION
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205 NO WARRANTY
206 ===========
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227
228 MAINTENANCE OF THE WORK
229 =======================
230
231 The Work has the status `author-maintained' if the Copyright Holder
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270 3a. If the Current Maintainer is reachable and agrees to pass
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274 b. If the Current Maintainer is not reachable and the Copyright
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276 then this takes effect immediately upon announcement.
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278 4. If you make an `intention announcement' as described in 2b. above
279 and after three months your intention is challenged neither by
280 the Current Maintainer nor by the Copyright Holder nor by other
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282 to name you as the (new) Current Maintainer.
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284 5. If the previously unreachable Current Maintainer becomes
285 reachable once more within three months of a change completed
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290 A change in the Current Maintainer does not, of itself, alter the fact
291 that the Work is distributed under the LPPL license.
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293 If you become the Current Maintainer of the Work, you should
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295 statement of your status as Current Maintainer. You should also
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297 in 2b) above.
298
299
300 WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE
301 ======================================================
302
303 This section contains important instructions, examples, and
304 recommendations for authors who are considering distributing their
305 works under this license. These authors are addressed as `you' in
306 this section.
307
308 Choosing This License or Another License
309 ----------------------------------------
310
311 If for any part of your work you want or need to use *distribution*
312 conditions that differ significantly from those in this license, then
313 do not refer to this license anywhere in your work but, instead,
314 distribute your work under a different license. You may use the text
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316 should not refer to the LPPL or otherwise give the impression that
317 your work is distributed under the LPPL.
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319 The document `modguide.tex' in the base LaTeX distribution explains
320 the motivation behind the conditions of this license. It explains,
321 for example, why distributing LaTeX under the GNU General Public
322 License (GPL) was considered inappropriate. Even if your work is
323 unrelated to LaTeX, the discussion in `modguide.tex' may still be
324 relevant, and authors intending to distribute their works under any
325 license are encouraged to read it.
326
327 A Recommendation on Modification Without Distribution
328 -----------------------------------------------------
329
330 It is wise never to modify a component of the Work, even for your own
331 personal use, without also meeting the above conditions for
332 distributing the modified component. While you might intend that such
333 modifications will never be distributed, often this will happen by
334 accident -- you may forget that you have modified that component; or
335 it may not occur to you when allowing others to access the modified
336 version that you are thus distributing it and violating the conditions
337 of this license in ways that could have legal implications and, worse,
338 cause problems for the community. It is therefore usually in your
339 best interest to keep your copy of the Work identical with the public
340 one. Many works provide ways to control the behavior of that work
341 without altering any of its licensed components.
342
343 How to Use This License
344 -----------------------
345
346 To use this license, place in each of the components of your work both
347 an explicit copyright notice including your name and the year the work
348 was authored and/or last substantially modified. Include also a
349 statement that the distribution and/or modification of that
350 component is constrained by the conditions in this license.
351
352 Here is an example of such a notice and statement:
353
354 %% pig.dtx
355 %% Copyright 2005 M. Y. Name
356 %
357 % This work may be distributed and/or modified under the
358 % conditions of the LaTeX Project Public License, either version 1.3
359 % of this license or (at your option) any later version.
360 % The latest version of this license is in
361 % http://www.latex-project.org/lppl.txt
362 % and version 1.3 or later is part of all distributions of LaTeX
363 % version 2005/12/01 or later.
364 %
365 % This work has the LPPL maintenance status `maintained'.
366 %
367 % The Current Maintainer of this work is M. Y. Name.
368 %
369 % This work consists of the files pig.dtx and pig.ins
370 % and the derived file pig.sty.
371
372 Given such a notice and statement in a file, the conditions
373 given in this license document would apply, with the `Work' referring
374 to the three files `pig.dtx', `pig.ins', and `pig.sty' (the last being
375 generated from `pig.dtx' using `pig.ins'), the `Base Interpreter'
376 referring to any `LaTeX-Format', and both `Copyright Holder' and
377 `Current Maintainer' referring to the person `M. Y. Name'.
378
379 If you do not want the Maintenance section of LPPL to apply to your
380 Work, change `maintained' above into `author-maintained'.
381 However, we recommend that you use `maintained', as the Maintenance
382 section was added in order to ensure that your Work remains useful to
383 the community even when you can no longer maintain and support it
384 yourself.
385
386 Derived Works That Are Not Replacements
387 ---------------------------------------
388
389 Several clauses of the LPPL specify means to provide reliability and
390 stability for the user community. They therefore concern themselves
391 with the case that a Derived Work is intended to be used as a
392 (compatible or incompatible) replacement of the original Work. If
393 this is not the case (e.g., if a few lines of code are reused for a
394 completely different task), then clauses 6b and 6d shall not apply.
395
396
397 Important Recommendations
398 -------------------------
399
400 Defining What Constitutes the Work
401
402 The LPPL requires that distributions of the Work contain all the
403 files of the Work. It is therefore important that you provide a
404 way for the licensee to determine which files constitute the Work.
405 This could, for example, be achieved by explicitly listing all the
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407 using a line such as:
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409 % This work consists of all files listed in manifest.txt.
410
411 in that place. In the absence of an unequivocal list it might be
412 impossible for the licensee to determine what is considered by you
413 to comprise the Work and, in such a case, the licensee would be
414 entitled to make reasonable conjectures as to which files comprise
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416