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LPPL Version 1.3c  2006-05-20

1 pylon 1.1 The LaTeX Project Public License
2     =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
4     LPPL Version 1.3c 2006-05-20
6     Copyright 1999 2002-2006 LaTeX3 Project
7     Everyone is allowed to distribute verbatim copies of this
8     license document, but modification of it is not allowed.
12     ========
14     The LaTeX Project Public License (LPPL) is the primary license under
15     which the the LaTeX kernel and the base LaTeX packages are distributed.
17     You may use this license for any work of which you hold the copyright
18     and which you wish to distribute. This license may be particularly
19     suitable if your work is TeX-related (such as a LaTeX package), but
20     it is written in such a way that you can use it even if your work is
21     unrelated to TeX.
24     below, gives instructions, examples, and recommendations for authors
25     who are considering distributing their works under this license.
27     This license gives conditions under which a work may be distributed
28     and modified, as well as conditions under which modified versions of
29     that work may be distributed.
31     We, the LaTeX3 Project, believe that the conditions below give you
32     the freedom to make and distribute modified versions of your work
33     that conform with whatever technical specifications you wish while
34     maintaining the availability, integrity, and reliability of
35     that work. If you do not see how to achieve your goal while
36     meeting these conditions, then read the document `cfgguide.tex'
37     and `modguide.tex' in the base LaTeX distribution for suggestions.
41     ===========
43     In this license document the following terms are used:
45     `Work'
46     Any work being distributed under this License.
48     `Derived Work'
49     Any work that under any applicable law is derived from the Work.
51     `Modification'
52     Any procedure that produces a Derived Work under any applicable
53     law -- for example, the production of a file containing an
54     original file associated with the Work or a significant portion of
55     such a file, either verbatim or with modifications and/or
56     translated into another language.
58     `Modify'
59     To apply any procedure that produces a Derived Work under any
60     applicable law.
62     `Distribution'
63     Making copies of the Work available from one person to another, in
64     whole or in part. Distribution includes (but is not limited to)
65     making any electronic components of the Work accessible by
66     file transfer protocols such as FTP or HTTP or by shared file
67     systems such as Sun's Network File System (NFS).
69     `Compiled Work'
70     A version of the Work that has been processed into a form where it
71     is directly usable on a computer system. This processing may
72     include using installation facilities provided by the Work,
73     transformations of the Work, copying of components of the Work, or
74     other activities. Note that modification of any installation
75     facilities provided by the Work constitutes modification of the Work.
77     `Current Maintainer'
78     A person or persons nominated as such within the Work. If there is
79     no such explicit nomination then it is the `Copyright Holder' under
80     any applicable law.
82     `Base Interpreter'
83     A program or process that is normally needed for running or
84     interpreting a part or the whole of the Work.
86     A Base Interpreter may depend on external components but these
87     are not considered part of the Base Interpreter provided that each
88     external component clearly identifies itself whenever it is used
89     interactively. Unless explicitly specified when applying the
90     license to the Work, the only applicable Base Interpreter is a
91     `LaTeX-Format' or in the case of files belonging to the
92     `LaTeX-format' a program implementing the `TeX language'.
97     ===========================================
99     1. Activities other than distribution and/or modification of the Work
100     are not covered by this license; they are outside its scope. In
101     particular, the act of running the Work is not restricted and no
102     requirements are made concerning any offers of support for the Work.
104     2. You may distribute a complete, unmodified copy of the Work as you
105     received it. Distribution of only part of the Work is considered
106     modification of the Work, and no right to distribute such a Derived
107     Work may be assumed under the terms of this clause.
109     3. You may distribute a Compiled Work that has been generated from a
110     complete, unmodified copy of the Work as distributed under Clause 2
111     above, as long as that Compiled Work is distributed in such a way that
112     the recipients may install the Compiled Work on their system exactly
113     as it would have been installed if they generated a Compiled Work
114     directly from the Work.
116     4. If you are the Current Maintainer of the Work, you may, without
117     restriction, modify the Work, thus creating a Derived Work. You may
118     also distribute the Derived Work without restriction, including
119     Compiled Works generated from the Derived Work. Derived Works
120     distributed in this manner by the Current Maintainer are considered to
121     be updated versions of the Work.
123     5. If you are not the Current Maintainer of the Work, you may modify
124     your copy of the Work, thus creating a Derived Work based on the Work,
125     and compile this Derived Work, thus creating a Compiled Work based on
126     the Derived Work.
128     6. If you are not the Current Maintainer of the Work, you may
129     distribute a Derived Work provided the following conditions are met
130     for every component of the Work unless that component clearly states
131     in the copyright notice that it is exempt from that condition. Only
132     the Current Maintainer is allowed to add such statements of exemption
133     to a component of the Work.
135     a. If a component of this Derived Work can be a direct replacement
136     for a component of the Work when that component is used with the
137     Base Interpreter, then, wherever this component of the Work
138     identifies itself to the user when used interactively with that
139     Base Interpreter, the replacement component of this Derived Work
140     clearly and unambiguously identifies itself as a modified version
141     of this component to the user when used interactively with that
142     Base Interpreter.
144     b. Every component of the Derived Work contains prominent notices
145     detailing the nature of the changes to that component, or a
146     prominent reference to another file that is distributed as part
147     of the Derived Work and that contains a complete and accurate log
148     of the changes.
150     c. No information in the Derived Work implies that any persons,
151     including (but not limited to) the authors of the original version
152     of the Work, provide any support, including (but not limited to)
153     the reporting and handling of errors, to recipients of the
154     Derived Work unless those persons have stated explicitly that
155     they do provide such support for the Derived Work.
157     d. You distribute at least one of the following with the Derived Work:
159     1. A complete, unmodified copy of the Work;
160     if your distribution of a modified component is made by
161     offering access to copy the modified component from a
162     designated place, then offering equivalent access to copy
163     the Work from the same or some similar place meets this
164     condition, even though third parties are not compelled to
165     copy the Work along with the modified component;
167     2. Information that is sufficient to obtain a complete,
168     unmodified copy of the Work.
170     7. If you are not the Current Maintainer of the Work, you may
171     distribute a Compiled Work generated from a Derived Work, as long as
172     the Derived Work is distributed to all recipients of the Compiled
173     Work, and as long as the conditions of Clause 6, above, are met with
174     regard to the Derived Work.
176     8. The conditions above are not intended to prohibit, and hence do not
177     apply to, the modification, by any method, of any component so that it
178     becomes identical to an updated version of that component of the Work as
179     it is distributed by the Current Maintainer under Clause 4, above.
181     9. Distribution of the Work or any Derived Work in an alternative
182     format, where the Work or that Derived Work (in whole or in part) is
183     then produced by applying some process to that format, does not relax or
184     nullify any sections of this license as they pertain to the results of
185     applying that process.
187     10. a. A Derived Work may be distributed under a different license
188     provided that license itself honors the conditions listed in
189     Clause 6 above, in regard to the Work, though it does not have
190     to honor the rest of the conditions in this license.
192     b. If a Derived Work is distributed under a different license, that
193     Derived Work must provide sufficient documentation as part of
194     itself to allow each recipient of that Derived Work to honor the
195     restrictions in Clause 6 above, concerning changes from the Work.
197     11. This license places no restrictions on works that are unrelated to
198     the Work, nor does this license place any restrictions on aggregating
199     such works with the Work by any means.
201     12. Nothing in this license is intended to, or may be used to, prevent
202     complete compliance by all parties with all applicable laws.
206     ===========
208     There is no warranty for the Work. Except when otherwise stated in
209     writing, the Copyright Holder provides the Work `as is', without
210     warranty of any kind, either expressed or implied, including, but not
211     limited to, the implied warranties of merchantability and fitness for a
212     particular purpose. The entire risk as to the quality and performance
213     of the Work is with you. Should the Work prove defective, you assume
214     the cost of all necessary servicing, repair, or correction.
216     In no event unless required by applicable law or agreed to in writing
217     will The Copyright Holder, or any author named in the components of the
218     Work, or any other party who may distribute and/or modify the Work as
219     permitted above, be liable to you for damages, including any general,
220     special, incidental or consequential damages arising out of any use of
221     the Work or out of inability to use the Work (including, but not limited
222     to, loss of data, data being rendered inaccurate, or losses sustained by
223     anyone as a result of any failure of the Work to operate with any other
224     programs), even if the Copyright Holder or said author or said other
225     party has been advised of the possibility of such damages.
229     =======================
231     The Work has the status `author-maintained' if the Copyright Holder
232     explicitly and prominently states near the primary copyright notice in
233     the Work that the Work can only be maintained by the Copyright Holder
234     or simply that it is `author-maintained'.
236     The Work has the status `maintained' if there is a Current Maintainer
237     who has indicated in the Work that they are willing to receive error
238     reports for the Work (for example, by supplying a valid e-mail
239     address). It is not required for the Current Maintainer to acknowledge
240     or act upon these error reports.
242     The Work changes from status `maintained' to `unmaintained' if there
243     is no Current Maintainer, or the person stated to be Current
244     Maintainer of the work cannot be reached through the indicated means
245     of communication for a period of six months, and there are no other
246     significant signs of active maintenance.
248     You can become the Current Maintainer of the Work by agreement with
249     any existing Current Maintainer to take over this role.
251     If the Work is unmaintained, you can become the Current Maintainer of
252     the Work through the following steps:
254     1. Make a reasonable attempt to trace the Current Maintainer (and
255     the Copyright Holder, if the two differ) through the means of
256     an Internet or similar search.
258     2. If this search is successful, then enquire whether the Work
259     is still maintained.
261     a. If it is being maintained, then ask the Current Maintainer
262     to update their communication data within one month.
264     b. If the search is unsuccessful or no action to resume active
265     maintenance is taken by the Current Maintainer, then announce
266     within the pertinent community your intention to take over
267     maintenance. (If the Work is a LaTeX work, this could be
268     done, for example, by posting to comp.text.tex.)
270     3a. If the Current Maintainer is reachable and agrees to pass
271     maintenance of the Work to you, then this takes effect
272     immediately upon announcement.
274     b. If the Current Maintainer is not reachable and the Copyright
275     Holder agrees that maintenance of the Work be passed to you,
276     then this takes effect immediately upon announcement.
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
281     people, then you may arrange for the Work to be changed so as
282     to name you as the (new) Current Maintainer.
284     5. If the previously unreachable Current Maintainer becomes
285     reachable once more within three months of a change completed
286     under the terms of 3b) or 4), then that Current Maintainer must
287     become or remain the Current Maintainer upon request provided
288     they then update their communication data within one month.
290     A change in the Current Maintainer does not, of itself, alter the fact
291     that the Work is distributed under the LPPL license.
293     If you become the Current Maintainer of the Work, you should
294     immediately provide, within the Work, a prominent and unambiguous
295     statement of your status as Current Maintainer. You should also
296     announce your new status to the same pertinent community as
297     in 2b) above.
301     ======================================================
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.
308     Choosing This License or Another License
309     ----------------------------------------
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
315     of this license as a model for your own license, but your license
316     should not refer to the LPPL or otherwise give the impression that
317     your work is distributed under the LPPL.
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.
327     A Recommendation on Modification Without Distribution
328     -----------------------------------------------------
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.
343     How to Use This License
344     -----------------------
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.
352     Here is an example of such a notice and statement:
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.
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'.
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.
386     Derived Works That Are Not Replacements
387     ---------------------------------------
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.
397     Important Recommendations
398     -------------------------
400     Defining What Constitutes the Work
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
406     files of the Work near the copyright notice of each file or by
407     using a line such as:
409     % This work consists of all files listed in manifest.txt.
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
415     the Work.

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