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1 | |||
2 | The LaTeX Project Public License | ||
3 | =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- | ||
4 | |||
5 | LPPL Version 1.3c 2008-05-04 | ||
6 | |||
7 | Copyright 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 | |||
12 | PREAMBLE | ||
13 | ======== | ||
14 | |||
15 | The LaTeX Project Public License (LPPL) is the primary license under | ||
16 | which the LaTeX kernel and the base LaTeX packages are distributed. | ||
17 | |||
18 | You may use this license for any work of which you hold the copyright | ||
19 | and which you wish to distribute. This license may be particularly | ||
20 | suitable if your work is TeX-related (such as a LaTeX package), but | ||
21 | it is written in such a way that you can use it even if your work is | ||
22 | unrelated to TeX. | ||
23 | |||
24 | The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE', | ||
25 | below, gives instructions, examples, and recommendations for authors | ||
26 | who are considering distributing their works under this license. | ||
27 | |||
28 | This license gives conditions under which a work may be distributed | ||
29 | and modified, as well as conditions under which modified versions of | ||
30 | that work may be distributed. | ||
31 | |||
32 | We, the LaTeX3 Project, believe that the conditions below give you | ||
33 | the freedom to make and distribute modified versions of your work | ||
34 | that conform with whatever technical specifications you wish while | ||
35 | maintaining the availability, integrity, and reliability of | ||
36 | that work. If you do not see how to achieve your goal while | ||
37 | meeting these conditions, then read the document `cfgguide.tex' | ||
38 | and `modguide.tex' in the base LaTeX distribution for suggestions. | ||
39 | |||
40 | |||
41 | DEFINITIONS | ||
42 | =========== | ||
43 | |||
44 | In this license document the following terms are used: | ||
45 | |||
46 | `Work' | ||
47 | Any work being distributed under this License. | ||
48 | |||
49 | `Derived Work' | ||
50 | Any work that under any applicable law is derived from the Work. | ||
51 | |||
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. | ||
58 | |||
59 | `Modify' | ||
60 | To apply any procedure that produces a Derived Work under any | ||
61 | applicable law. | ||
62 | |||
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 | ||
67 | file transfer protocols such as FTP or HTTP or by shared file | ||
68 | systems such as Sun's Network File System (NFS). | ||
69 | |||
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 | ||
76 | facilities provided by the Work constitutes modification of the Work. | ||
77 | |||
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. | ||
82 | |||
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. | ||
86 | |||
87 | A Base Interpreter may depend on external components but these | ||
88 | are not considered part of the Base Interpreter provided that each | ||
89 | external component clearly identifies itself whenever it is used | ||
90 | interactively. Unless explicitly specified when applying the | ||
91 | license to the Work, the only applicable Base Interpreter is a | ||
92 | `LaTeX-Format' or in the case of files belonging to the | ||
93 | `LaTeX-format' a program implementing the `TeX language'. | ||
94 | |||
95 | |||
96 | |||
97 | CONDITIONS ON DISTRIBUTION AND MODIFICATION | ||
98 | =========================================== | ||
99 | |||
100 | 1. Activities other than distribution and/or modification of the Work | ||
101 | are not covered by this license; they are outside its scope. In | ||
102 | particular, the act of running the Work is not restricted and no | ||
103 | requirements are made concerning any offers of support for the Work. | ||
104 | |||
105 | 2. You may distribute a complete, unmodified copy of the Work as you | ||
106 | received it. Distribution of only part of the Work is considered | ||
107 | modification of the Work, and no right to distribute such a Derived | ||
108 | Work may be assumed under the terms of this clause. | ||
109 | |||
110 | 3. You may distribute a Compiled Work that has been generated from a | ||
111 | complete, unmodified copy of the Work as distributed under Clause 2 | ||
112 | above, as long as that Compiled Work is distributed in such a way that | ||
113 | the recipients may install the Compiled Work on their system exactly | ||
114 | as it would have been installed if they generated a Compiled Work | ||
115 | directly from the Work. | ||
116 | |||
117 | 4. If you are the Current Maintainer of the Work, you may, without | ||
118 | restriction, modify the Work, thus creating a Derived Work. You may | ||
119 | also distribute the Derived Work without restriction, including | ||
120 | Compiled Works generated from the Derived Work. Derived Works | ||
121 | distributed in this manner by the Current Maintainer are considered to | ||
122 | be updated versions of the Work. | ||
123 | |||
124 | 5. If you are not the Current Maintainer of the Work, you may modify | ||
125 | your copy of the Work, thus creating a Derived Work based on the Work, | ||
126 | and compile this Derived Work, thus creating a Compiled Work based on | ||
127 | the Derived Work. | ||
128 | |||
129 | 6. If you are not the Current Maintainer of the Work, you may | ||
130 | distribute a Derived Work provided the following conditions are met | ||
131 | for every component of the Work unless that component clearly states | ||
132 | in the copyright notice that it is exempt from that condition. Only | ||
133 | the Current Maintainer is allowed to add such statements of exemption | ||
134 | to a component of the Work. | ||
135 | |||
136 | a. If a component of this Derived Work can be a direct replacement | ||
137 | for a component of the Work when that component is used with the | ||
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 | ||
142 | of this component to the user when used interactively with that | ||
143 | Base Interpreter. | ||
144 | |||
145 | b. Every component of the Derived Work contains prominent notices | ||
146 | detailing the nature of the changes to that component, or a | ||
147 | prominent reference to another file that is distributed as part | ||
148 | of the Derived Work and that contains a complete and accurate log | ||
149 | of the changes. | ||
150 | |||
151 | c. No information in the Derived Work implies that any persons, | ||
152 | including (but not limited to) the authors of the original version | ||
153 | of the Work, provide any support, including (but not limited to) | ||
154 | the reporting and handling of errors, to recipients of the | ||
155 | Derived Work unless those persons have stated explicitly that | ||
156 | they do provide such support for the Derived Work. | ||
157 | |||
158 | d. You distribute at least one of the following with the Derived Work: | ||
159 | |||
160 | 1. A complete, unmodified copy of the Work; | ||
161 | if your distribution of a modified component is made by | ||
162 | offering access to copy the modified component from a | ||
163 | designated place, then offering equivalent access to copy | ||
164 | the Work from the same or some similar place meets this | ||
165 | condition, even though third parties are not compelled to | ||
166 | copy the Work along with the modified component; | ||
167 | |||
168 | 2. Information that is sufficient to obtain a complete, | ||
169 | unmodified copy of the Work. | ||
170 | |||
171 | 7. If you are not the Current Maintainer of the Work, you may | ||
172 | distribute a Compiled Work generated from a Derived Work, as long as | ||
173 | the Derived Work is distributed to all recipients of the Compiled | ||
174 | Work, and as long as the conditions of Clause 6, above, are met with | ||
175 | regard to the Derived Work. | ||
176 | |||
177 | 8. The conditions above are not intended to prohibit, and hence do not | ||
178 | apply to, the modification, by any method, of any component so that it | ||
179 | becomes identical to an updated version of that component of the Work as | ||
180 | it is distributed by the Current Maintainer under Clause 4, above. | ||
181 | |||
182 | 9. Distribution of the Work or any Derived Work in an alternative | ||
183 | format, where the Work or that Derived Work (in whole or in part) is | ||
184 | then produced by applying some process to that format, does not relax or | ||
185 | nullify any sections of this license as they pertain to the results of | ||
186 | applying that process. | ||
187 | |||
188 | 10. a. A Derived Work may be distributed under a different license | ||
189 | provided that license itself honors the conditions listed in | ||
190 | Clause 6 above, in regard to the Work, though it does not have | ||
191 | to honor the rest of the conditions in this license. | ||
192 | |||
193 | b. If a Derived Work is distributed under a different license, that | ||
194 | Derived Work must provide sufficient documentation as part of | ||
195 | itself to allow each recipient of that Derived Work to honor the | ||
196 | restrictions in Clause 6 above, concerning changes from the Work. | ||
197 | |||
198 | 11. This license places no restrictions on works that are unrelated to | ||
199 | the Work, nor does this license place any restrictions on aggregating | ||
200 | such works with the Work by any means. | ||
201 | |||
202 | 12. Nothing in this license is intended to, or may be used to, prevent | ||
203 | complete compliance by all parties with all applicable laws. | ||
204 | |||
205 | |||
206 | NO WARRANTY | ||
207 | =========== | ||
208 | |||
209 | There is no warranty for the Work. Except when otherwise stated in | ||
210 | writing, the Copyright Holder provides the Work `as is', without | ||
211 | warranty of any kind, either expressed or implied, including, but not | ||
212 | limited to, the implied warranties of merchantability and fitness for a | ||
213 | particular purpose. The entire risk as to the quality and performance | ||
214 | of the Work is with you. Should the Work prove defective, you assume | ||
215 | the cost of all necessary servicing, repair, or correction. | ||
216 | |||
217 | In no event unless required by applicable law or agreed to in writing | ||
218 | will The Copyright Holder, or any author named in the components of the | ||
219 | Work, or any other party who may distribute and/or modify the Work as | ||
220 | permitted above, be liable to you for damages, including any general, | ||
221 | special, incidental or consequential damages arising out of any use of | ||
222 | the Work or out of inability to use the Work (including, but not limited | ||
223 | to, loss of data, data being rendered inaccurate, or losses sustained by | ||
224 | anyone as a result of any failure of the Work to operate with any other | ||
225 | programs), even if the Copyright Holder or said author or said other | ||
226 | party has been advised of the possibility of such damages. | ||
227 | |||
228 | |||
229 | MAINTENANCE OF THE WORK | ||
230 | ======================= | ||
231 | |||
232 | The Work has the status `author-maintained' if the Copyright Holder | ||
233 | explicitly and prominently states near the primary copyright notice in | ||
234 | the Work that the Work can only be maintained by the Copyright Holder | ||
235 | or simply that it is `author-maintained'. | ||
236 | |||
237 | The Work has the status `maintained' if there is a Current Maintainer | ||
238 | who has indicated in the Work that they are willing to receive error | ||
239 | reports for the Work (for example, by supplying a valid e-mail | ||
240 | address). It is not required for the Current Maintainer to acknowledge | ||
241 | or act upon these error reports. | ||
242 | |||
243 | The Work changes from status `maintained' to `unmaintained' if there | ||
244 | is no Current Maintainer, or the person stated to be Current | ||
245 | Maintainer of the work cannot be reached through the indicated means | ||
246 | of communication for a period of six months, and there are no other | ||
247 | significant signs of active maintenance. | ||
248 | |||
249 | You can become the Current Maintainer of the Work by agreement with | ||
250 | any existing Current Maintainer to take over this role. | ||
251 | |||
252 | If the Work is unmaintained, you can become the Current Maintainer of | ||
253 | the Work through the following steps: | ||
254 | |||
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. | ||
264 | |||
265 | b. If the search is unsuccessful or no action to resume active | ||
266 | maintenance is taken by the Current Maintainer, then announce | ||
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 | |||
291 | A change in the Current Maintainer does not, of itself, alter the fact | ||
292 | that the Work is distributed under the LPPL license. | ||
293 | |||
294 | If you become the Current Maintainer of the Work, you should | ||
295 | immediately provide, within the Work, a prominent and unambiguous | ||
296 | statement of your status as Current Maintainer. You should also | ||
297 | announce your new status to the same pertinent community as | ||
298 | in 2b) above. | ||
299 | |||
300 | |||
301 | WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE | ||
302 | ====================================================== | ||
303 | |||
304 | This section contains important instructions, examples, and | ||
305 | recommendations for authors who are considering distributing their | ||
306 | works under this license. These authors are addressed as `you' in | ||
307 | this section. | ||
308 | |||
309 | Choosing This License or Another License | ||
310 | ---------------------------------------- | ||
311 | |||
312 | If for any part of your work you want or need to use *distribution* | ||
313 | conditions that differ significantly from those in this license, then | ||
314 | do not refer to this license anywhere in your work but, instead, | ||
315 | distribute your work under a different license. You may use the text | ||
316 | of this license as a model for your own license, but your license | ||
317 | should not refer to the LPPL or otherwise give the impression that | ||
318 | your work is distributed under the LPPL. | ||
319 | |||
320 | The document `modguide.tex' in the base LaTeX distribution explains | ||
321 | the motivation behind the conditions of this license. It explains, | ||
322 | for example, why distributing LaTeX under the GNU General Public | ||
323 | License (GPL) was considered inappropriate. Even if your work is | ||
324 | unrelated to LaTeX, the discussion in `modguide.tex' may still be | ||
325 | relevant, and authors intending to distribute their works under any | ||
326 | license are encouraged to read it. | ||
327 | |||
328 | A Recommendation on Modification Without Distribution | ||
329 | ----------------------------------------------------- | ||
330 | |||
331 | It is wise never to modify a component of the Work, even for your own | ||
332 | personal use, without also meeting the above conditions for | ||
333 | distributing the modified component. While you might intend that such | ||
334 | modifications will never be distributed, often this will happen by | ||
335 | accident -- you may forget that you have modified that component; or | ||
336 | it may not occur to you when allowing others to access the modified | ||
337 | version that you are thus distributing it and violating the conditions | ||
338 | of this license in ways that could have legal implications and, worse, | ||
339 | cause problems for the community. It is therefore usually in your | ||
340 | best interest to keep your copy of the Work identical with the public | ||
341 | one. Many works provide ways to control the behavior of that work | ||
342 | without altering any of its licensed components. | ||
343 | |||
344 | How to Use This License | ||
345 | ----------------------- | ||
346 | |||
347 | To use this license, place in each of the components of your work both | ||
348 | an explicit copyright notice including your name and the year the work | ||
349 | was authored and/or last substantially modified. Include also a | ||
350 | statement that the distribution and/or modification of that | ||
351 | component is constrained by the conditions in this license. | ||
352 | |||
353 | Here 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 | |||
373 | Given such a notice and statement in a file, the conditions | ||
374 | given in this license document would apply, with the `Work' referring | ||
375 | to the three files `pig.dtx', `pig.ins', and `pig.sty' (the last being | ||
376 | generated from `pig.dtx' using `pig.ins'), the `Base Interpreter' | ||
377 | referring to any `LaTeX-Format', and both `Copyright Holder' and | ||
378 | `Current Maintainer' referring to the person `M. Y. Name'. | ||
379 | |||
380 | If you do not want the Maintenance section of LPPL to apply to your | ||
381 | Work, change `maintained' above into `author-maintained'. | ||
382 | However, we recommend that you use `maintained', as the Maintenance | ||
383 | section was added in order to ensure that your Work remains useful to | ||
384 | the community even when you can no longer maintain and support it | ||
385 | yourself. | ||
386 | |||
387 | Derived Works That Are Not Replacements | ||
388 | --------------------------------------- | ||
389 | |||
390 | Several clauses of the LPPL specify means to provide reliability and | ||
391 | stability for the user community. They therefore concern themselves | ||
392 | with the case that a Derived Work is intended to be used as a | ||
393 | (compatible or incompatible) replacement of the original Work. If | ||
394 | this is not the case (e.g., if a few lines of code are reused for a | ||
395 | completely different task), then clauses 6b and 6d shall not apply. | ||
396 | |||
397 | |||
398 | Important 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 | |||
419 | |||
420 | |||
421 | |||
422 | |||