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1
2
3The LaTeX Project Public License
4=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
5
6LPPL Version 1.2 1999-09-03
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 (other than as necessitated by the file
123conventions of the target file systems) is considered to be a
124modification of the file.
125
126The distribution conditions in this license do not have to be
127applied to files that have been modified in accordance with the
128above conditions. Note, however, that Condition 7. does apply to
129any such modified file.
130
131The conditions above are not intended to prohibit, and hence do not
132apply to, the updating, by any method, of a file so that it becomes
133identical to the latest version of that file of The Program.
134
135
136
137A Recommendation on Modification Without Distribution
138-----------------------------------------------------
139
140It is wise never to modify a file of The Program, even for your own
141personal use, without also meeting the above eight conditions for
142distributing the modified file. While you might intend that such
143modified files will never be distributed, often this will happen by
144accident -- you may forget that you have modified the file; or it may
145not occur to you when allowing others to access the modified file
146that you are thus distributing it and violating the conditions of
147this license. It is usually in your best interest to keep your copy
148of The Program identical with the public one. Many programs provide
149ways to control the behavior of that program without altering its
150licensed files.
151
152
153Additional Conditions on Individual Files of The Program
154--------------------------------------------------------
155
156An individual file of The Program may bear additional conditions that
157supplement and/or supersede the conditions in this license if, and only
158if, such additional conditions exclusively concern modification of the
159file or distribution of a modified version of the file. The conditions
160on individual files of The Program therefore may differ only with
161respect to the kind and extent of modification of those files that
162is allowed, and with respect to the distribution of modified versions
163of those files.
164
165
166Additional Conditions on LaTeX Software Files
167---------------------------------------------
168
169If a file of The Program is intended to be used with LaTeX (that is,
170if it is a LaTeX software file), then the following additional
171conditions, which supplement and/or supersede the conditions
172above, apply to the file according to its filename extension:
173
174 - You may not modify any file with filename extension `.ins` since
175 these are installation files containing the legal notices that are
176 placed in the files they generate.
177
178 - You may distribute modified versions of files with filename
179 extension `.fd` (LaTeX font definition files) under the standard
180 conditions of the LPPL as described above. You may also distribute
181 such modified LaTeX font definition files with their original names
182 provided that:
183 (1) the only changes to the original files either enable use of
184 available fonts or prevent attempts to access unavailable fonts;
185 (2) you also distribute the original, unmodified files (TeX input
186 paths can be used to control which set of LaTeX font definition
187 files is actually used by TeX).
188
189 - You may distribute modified versions of files with filename
190 extension `.cfg` (configuration files) with their original names.
191 The Program may (and usually will) specify the range of commands
192 that are allowed in a particular configuration file.
193
194Because of portability and exchangeability issues in LaTeX software,
195The LaTeX3 Project deprecates the distribution of modified versions of
196components of LaTeX or of generally available contributed code for them,
197but such distribution can meet the conditions of this license.
198
199
200NO WARRANTY
201===========
202
203There is no warranty for The Program. Except when otherwise stated in
204writing, The Copyright Holder provides The Program `as is`, without
205warranty of any kind, either expressed or implied, including, but not
206limited to, the implied warranties of merchantability and fitness for
207a particular purpose. The entire risk as to the quality and performance
208of The Program is with you. Should The Program prove defective, you
209assume the cost of all necessary servicing, repair, or correction.
210
211In no event unless agreed to in writing will The Copyright Holder, or
212any author named in the files of The Program, or any other party who may
213distribute and/or modify The Program as permitted above, be liable to
214you for damages, including any general, special, incidental or
215consequential damages arising out of any use of The Program or out of
216inability to use The Program (including, but not limited to, loss of
217data, data being rendered inaccurate, or losses sustained by anyone as
218a result of any failure of The Program to operate with any other
219programs), even if The Copyright Holder or said author or said other
220party has been advised of the possibility of such damages.
221
222
223WHETHER AND HOW TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE
224=========================================================
225
226This section contains important instructions, examples, and
227recommendations for authors who are considering distributing their
228programs under this license. These authors are addressed as `you` in
229this section.
230
231
232Choosing This License or Another License
233----------------------------------------
234
235If for any part of your program you want or need to use *distribution*
236conditions that differ from those in this license, then do not refer to
237this license anywhere in your program but instead distribute your
238program under a different license. You may use the text of this license
239as a model for your own license, but your license should not refer to
240the LPPL or otherwise give the impression that your program is
241distributed under the LPPL.
242
243The document `modguide.tex` in the base LaTeX distribution explains
244the motivation behind the conditions of this license. It explains,
245for example, why distributing LaTeX under the GNU General Public
246License (GPL) was considered inappropriate. Even if your program is
247unrelated to LaTeX, the discussion in `modguide.tex` may still be
248relevant, and authors intending to distribute their programs under any
249license are encouraged to read it.
250
251
252How to Use This License
253-----------------------
254
255To use this license, place in each of the files of your program both
256an explicit copyright notice including your name and the year and also
257a statement that the distribution and/or modification of the file is
258constrained by the conditions in this license.
259
260Here is an example of such a notice and statement:
261
262 %% pig.dtx
263 %% Copyright 2001 M. Y. Name
264 %
265 % This program may be distributed and/or modified under the
266 % conditions of the LaTeX Project Public License, either version 1.2
267 % of this license or (at your option) any later version.
268 % The latest version of this license is in
269 % http://www.latex-project.org/lppl.txt
270 % and version 1.2 or later is part of all distributions of LaTeX
271 % version 1999/12/01 or later.
272 %
273 % This program consists of the files pig.dtx and pig.ins
274
275Given such a notice and statement in a file, the conditions given in
276this license document would apply, with `The Program` referring to the
277two files `pig.dtx` and `pig.ins`, and `The Copyright Holder` referring
278to the person `M. Y. Name`.
279
280
281Important Recommendations
282-------------------------
283
284 Defining What Constitutes The Program
285
286 The LPPL requires that distributions of The Program contain all the
287 files of The Program. It is therefore important that you provide a
288 way for the licensee to determine which files constitute The Program.
289 This could, for example, be achieved by explicitly listing all the
290 files of The Program near the copyright notice of each file or by
291 using a line like
292
293 % This program consists of all files listed in manifest.txt.
294
295 in that place. In the absence of an unequivocal list it might be
296 impossible for the licensee to determine what is considered by you
297 to comprise The Program.
298
299 Noting Exceptional Files
300
301 If The Program contains any files bearing additional conditions on
302 modification, or on distribution of modified versions, of those
303 files (other than those listed in `Additional Conditions on LaTeX
304 Software Files`), then it is recommended that The Program contain a
305 prominent file that defines the exceptional conditions, and either
306 lists the exceptional files or defines one or more categories of
307 exceptional files.
308
309 Files containing the text of a license (such as this file) are
310 often examples of files bearing more restrictive conditions on
311 modification. LaTeX configuration files (with filename extension
312 `.cfg`) are examples of files bearing less restrictive conditions
313 on the distribution of a modified version of the file. The
314 additional conditions on LaTeX software given above are examples
315 of declaring a category of files bearing exceptional additional
316 conditions.
317
318
319
320