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1
2
3The LaTeX Project Public License
4=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
5
6LPPL Version 1.1 1999-07-10
7
8Copyright 1999 LaTeX3 Project
9 Everyone is allowed to distribute verbatim copies of this
10 license document, but modification of it is not allowed.
11
12
13PREAMBLE
14========
15
16The LaTeX Project Public License (LPPL) is the license under which the
17base LaTeX distribution is distributed.
18
19You may use this license for any program that you have written and wish
20to distribute. This license may be particularly suitable if your
21program is TeX-related (such as a LaTeX package), but you may use it
22even if your program is unrelated to TeX. The section `WHETHER AND HOW
23TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE`, below, gives instructions,
24examples, and recommendations for authors who are considering
25distributing their programs under this license.
26
27In this license document, `The Program` refers to any program
28distributed under this license.
29
30This license gives conditions under which The Program may be distributed
31and conditions under which modified versions of The Program may be
32distributed. Individual files of The Program may bear supplementary
33and/or superseding conditions on modification of themselves and on the
34distribution of modified versions of themselves, but *no* file of The
35Program may bear supplementary or superseding conditions on the
36distribution of an unmodified copy of the file. A distributor wishing
37to distribute a complete, unmodified copy of The Program therefore
38needs to check the conditions only in this license and nowhere else.
39
40Activities other than distribution and/or modification of The Program
41are not covered by this license; they are outside its scope. In
42particular, the act of running The Program is not restricted.
43
44We, the LaTeX3 Project, believe that the conditions below give you
45the freedom to make and distribute modified versions of The Program
46that conform with whatever technical specifications you wish while
47maintaining the availability, integrity, and reliability of
48The Program. If you do not see how to achieve your goal while
49meeting these conditions, then read the document `cfgguide.tex`
50in the base LaTeX distribution for suggestions.
51
52
53CONDITIONS ON DISTRIBUTION AND MODIFICATION
54===========================================
55
56You may distribute a complete, unmodified copy of The Program.
57Distribution of only part of The Program is not allowed.
58
59You may not modify in any way a file of The Program that bears a legal
60notice forbidding modification of that file.
61
62You may distribute a modified file of The Program if, and only if, the
63following eight conditions are met:
64
65 1. You must meet any additional conditions borne by the file on the
66 distribution of a modified version of the file as described below
67 in the subsection `Additional Conditions on Individual Files of
68 The Program`.
69
70 2. If the file is a LaTeX software file, then you must meet any
71 applicable additional conditions on the distribution of a modified
72 version of the file that are described below in the subsection
73 `Additional Conditions on LaTeX Software Files`.
74
75 3. You must not distribute the modified file with the filename of the
76 original file.
77
78 4. In the modified file, you must acknowledge the authorship and
79 name of the original file, and the name (if any) of the program
80 which contains it.
81
82 5. You must change any identification string in the file to indicate
83 clearly that the modified file is not part of The Program.
84
85 6. You must change any addresses in the modified file for the
86 reporting of errors in the file or in The Program generally to
87 ensure that reports for files no longer maintained by the original
88 maintainers will be directed to the maintainers of the modified
89 files.
90
91 7. You must distribute the modified file under a license that forbids
92 distribution both of the modified file and of any files derived
93 from the modified file with the filename of the original file.
94
95 8. You must do either (A) or (B):
96
97 (A) distribute a copy of The Program (that is, a complete,
98 unmodified copy of The Program) together with the modified
99 file; if your distribution of the modified file is made by
100 offering access to copy the modified file from a designated
101 place, then offering equivalent access to copy The Program
102 from the same place meets this condition, even though third
103 parties are not compelled to copy The Program along with the
104 modified file;
105
106 (B) provide to those who receive the modified file information
107 that is sufficient for them to obtain a copy of The Program;
108 for example, you may provide a Uniform Resource Locator (URL)
109 for a site that you expect will provide them with a copy of
110 The Program free of charge (either the version from which
111 your modification is derived, or perhaps a later version).
112
113Note that in the above, `distribution` of a file means making the
114file available to others by any means. This includes, for instance,
115installing the file on any machine in such a way that the file is
116accessible by users other than yourself. `Modification` of a file
117means any procedure that produces a derivative file under any
118applicable law -- that is, a file containing the original file or
119a significant portion of it, either verbatim or with modifications
120and/or translated into another language.
121
122Changing the name of a file is considered to be a modification of
123the file.
124
125The distribution conditions in this license do not have to be
126applied to files that have been modified in accordance with the
127above conditions. Note, however, that Condition 7. does apply to
128any such modified file.
129
130The conditions above are not intended to prohibit, and hence do not
131apply to, the updating, by any method, of a file so that it becomes
132identical to the latest version of that file of The Program.
133
134
135
136A Recommendation on Modification Without Distribution
137-----------------------------------------------------
138
139It is wise never to modify a file of The Program, even for your own
140personal use, without also meeting the above eight conditions for
141distributing the modified file. While you might intend that such
142modified files will never be distributed, often this will happen by
143accident -- you may forget that you have modified the file; or it may
144not occur to you when allowing others to access the modified file
145that you are thus distributing it and violating the conditions of
146this license. It is usually in your best interest to keep your copy
147of The Program identical with the public one. Many programs provide
148ways to control the behavior of that program without altering its
149licensed files.
150
151
152Additional Conditions on Individual Files of The Program
153--------------------------------------------------------
154
155An individual file of The Program may bear additional conditions that
156supplement and/or supersede the conditions in this license if, and only
157if, such additional conditions exclusively concern modification of the
158file or distribution of a modified version of the file. The conditions
159on individual files of The Program therefore may differ only with
160respect to the kind and extent of modification of those files that
161is allowed, and with respect to the distribution of modified versions
162of those files.
163
164
165Additional Conditions on LaTeX Software Files
166---------------------------------------------
167
168If a file of The Program is intended to be used with LaTeX (that is,
169if it is a LaTeX software file), then the following additional
170conditions, which supplement and/or supersede the conditions
171above, apply to the file according to its filename extension:
172
173 - You may not modify any file with filename extension `.ins` since
174 these are installation files containing the legal notices that are
175 placed in the files they generate.
176
177 - You may distribute modified versions of files with filename
178 extension `.fd` (LaTeX font definition files) under the standard
179 conditions of the LPPL as described above. You may also distribute
180 such modified LaTeX font definition files with their original names
181 provided that:
182 (1) the only changes to the original files either enable use of
183 available fonts or prevent attempts to access unavailable fonts;
184 (2) you also distribute the original, unmodified files (TeX input
185 paths can be used to control which set of LaTeX font definition
186 files is actually used by TeX).
187
188 - You may distribute modified versions of files with filename
189 extension `.cfg` (configuration files) with their original names.
190 The Program may (and usually will) specify the range of commands
191 that are allowed in a particular configuration file.
192
193Because of portability and exchangeability issues in LaTeX software,
194The LaTeX3 Project deprecates the distribution of modified versions of
195components of LaTeX or of generally available contributed code for them,
196but such distribution can meet the conditions of this license.
197
198
199NO WARRANTY
200===========
201
202There is no warranty for The Program. Except when otherwise stated in
203writing, The Copyright Holder provides The Program `as is`, without
204warranty of any kind, either expressed or implied, including, but not
205limited to, the implied warranties of merchantability and fitness for
206a particular purpose. The entire risk as to the quality and performance
207of The Program is with you. Should The Program prove defective, you
208assume the cost of all necessary servicing, repair, or correction.
209
210In no event unless agreed to in writing will The Copyright Holder, or
211any author named in the files of The Program, or any other party who may
212distribute and/or modify The Program as permitted below, be liable to
213you for damages, including any general, special, incidental or
214consequential damages arising out of any use of The Program or out of
215inability to use The Program (including, but not limited to, loss of
216data, data being rendered inaccurate, or losses sustained by anyone as
217a result of any failure of The Program to operate with any other
218programs), even if The Copyright Holder or said author or said other
219party has been advised of the possibility of such damages.
220
221
222WHETHER AND HOW TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE
223=========================================================
224
225This section contains important instructions, examples, and
226recommendations for authors who are considering distributing their
227programs under this license. These authors are addressed as `you` in
228this section.
229
230
231Choosing This License or Another License
232----------------------------------------
233
234If for any part of your program you want or need to use *distribution*
235conditions that differ from those in this license, then do not refer to
236this license anywhere in your program but instead distribute your
237program under a different license. You may use the text of this license
238as a model for your own license, but your license should not refer to
239the LPPL or otherwise give the impression that your program is
240distributed under the LPPL.
241
242The document `modguide.tex` in the base LaTeX distribution explains
243the motivation behind the conditions of this license. It explains,
244for example, why distributing LaTeX under the GNU General Public
245License (GPL) was considered inappropriate. Even if your program is
246unrelated to LaTeX, the discussion in `modguide.tex` may still be
247relevant, and authors intending to distribute their programs under any
248license are encouraged to read it.
249
250
251How to Use This License
252-----------------------
253
254To use this license, place in each of the files of your program both
255an explicit copyright notice including your name and the year and also
256a statement that the distribution and/or modification of the file is
257constrained by the conditions in this license.
258
259Here is an example of such a notice and statement:
260
261 %% pig.dtx
262 %% Copyright 2001 M. Y. Name
263 %
264 % This program may be distributed and/or modified under the
265 % conditions of the LaTeX Project Public License, either version 1.1
266 % of this license or (at your option) any later version.
267 % The latest version of this license is in
268 % http://www.latex-project.org/lppl.txt
269 % and version 1.1 or later is part of all distributions of LaTeX
270 % version 1999/06/01 or later.
271 %
272 % This program consists of the files pig.dtx and pig.ins
273
274Given such a notice and statement in a file, the conditions given in
275this license document would apply, with `The Program` referring to the
276two files `pig.dtx` and `pig.ins`, and `The Copyright Holder` referring
277to the person `M. Y. Name`.
278
279
280Important Recommendations
281-------------------------
282
283 Defining What Constitutes The Program
284
285 The LPPL requires that distributions of The Program contain all the
286 files of The Program. It is therefore important that you provide a
287 way for the licensee to determine which files constitute The Program.
288 This could, for example, be achieved by explicitly listing all the
289 files of The Program near the copyright notice of each file or by
290 using a line like
291
292 % This program consists of all files listed in manifest.txt.
293
294 in that place. In the absence of an unequivocal list it might be
295 impossible for the licensee to determine what is considered by you
296 to comprise The Program.
297
298 Noting Exceptional Files
299
300 If The Program contains any files bearing additional conditions on
301 modification, or on distribution of modified versions, of those
302 files (other than those listed in `Additional Conditions on LaTeX
303 Software Files`), then it is recommended that The Program contain a
304 prominent file that defines the exceptional conditions, and either
305 lists the exceptional files or defines one or more categories of
306 exceptional files.
307
308 Files containing the text of a license (such as this file) are
309 often examples of files bearing more restrictive conditions on
310 modification. LaTeX configuration files (with filename extension
311 `.cfg`) are examples of files bearing less restrictive conditions
312 on the distribution of a modified version of the file. The
313 additional conditions on LaTeX software given above are examples
314 of declaring a category of files bearing exceptional additional
315 conditions.
316