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LaTeX Project Public License

1
2 The LaTeX Project Public License
3 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
4
5 LPPL Version 1.2 1999-09-03
6
7 Copyright 1999 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 license under which the
16 base LaTeX distribution is distributed.
17
18 You may use this license for any program that you have written and wish
19 to distribute. This license may be particularly suitable if your
20 program is TeX-related (such as a LaTeX package), but you may use it
21 even if your program is unrelated to TeX. The section `WHETHER AND HOW
22 TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE', below, gives instructions,
23 examples, and recommendations for authors who are considering
24 distributing their programs under this license.
25
26 In this license document, `The Program' refers to any program
27 distributed under this license.
28
29 This license gives conditions under which The Program may be distributed
30 and conditions under which modified versions of The Program may be
31 distributed. Individual files of The Program may bear supplementary
32 and/or superseding conditions on modification of themselves and on the
33 distribution of modified versions of themselves, but *no* file of The
34 Program may bear supplementary or superseding conditions on the
35 distribution of an unmodified copy of the file. A distributor wishing
36 to distribute a complete, unmodified copy of The Program therefore
37 needs to check the conditions only in this license and nowhere else.
38
39 Activities other than distribution and/or modification of The Program
40 are not covered by this license; they are outside its scope. In
41 particular, the act of running The Program is not restricted.
42
43 We, the LaTeX3 Project, believe that the conditions below give you
44 the freedom to make and distribute modified versions of The Program
45 that conform with whatever technical specifications you wish while
46 maintaining the availability, integrity, and reliability of
47 The Program. If you do not see how to achieve your goal while
48 meeting these conditions, then read the document `cfgguide.tex'
49 in the base LaTeX distribution for suggestions.
50
51
52 CONDITIONS ON DISTRIBUTION AND MODIFICATION
53 ===========================================
54
55 You may distribute a complete, unmodified copy of The Program.
56 Distribution of only part of The Program is not allowed.
57
58 You may not modify in any way a file of The Program that bears a legal
59 notice forbidding modification of that file.
60
61 You may distribute a modified file of The Program if, and only if, the
62 following eight conditions are met:
63
64 1. You must meet any additional conditions borne by the file on the
65 distribution of a modified version of the file as described below
66 in the subsection `Additional Conditions on Individual Files of
67 The Program'.
68
69 2. If the file is a LaTeX software file, then you must meet any
70 applicable additional conditions on the distribution of a modified
71 version of the file that are described below in the subsection
72 `Additional Conditions on LaTeX Software Files'.
73
74 3. You must not distribute the modified file with the filename of the
75 original file.
76
77 4. In the modified file, you must acknowledge the authorship and
78 name of the original file, and the name (if any) of the program
79 which contains it.
80
81 5. You must change any identification string in the file to indicate
82 clearly that the modified file is not part of The Program.
83
84 6. You must change any addresses in the modified file for the
85 reporting of errors in the file or in The Program generally to
86 ensure that reports for files no longer maintained by the original
87 maintainers will be directed to the maintainers of the modified
88 files.
89
90 7. You must distribute the modified file under a license that forbids
91 distribution both of the modified file and of any files derived
92 from the modified file with the filename of the original file.
93
94 8. You must do either (A) or (B):
95
96 (A) distribute a copy of The Program (that is, a complete,
97 unmodified copy of The Program) together with the modified
98 file; if your distribution of the modified file is made by
99 offering access to copy the modified file from a designated
100 place, then offering equivalent access to copy The Program
101 from the same place meets this condition, even though third
102 parties are not compelled to copy The Program along with the
103 modified file;
104
105 (B) provide to those who receive the modified file information
106 that is sufficient for them to obtain a copy of The Program;
107 for example, you may provide a Uniform Resource Locator (URL)
108 for a site that you expect will provide them with a copy of
109 The Program free of charge (either the version from which
110 your modification is derived, or perhaps a later version).
111
112 Note that in the above, `distribution' of a file means making the
113 file available to others by any means. This includes, for instance,
114 installing the file on any machine in such a way that the file is
115 accessible by users other than yourself. `Modification' of a file
116 means any procedure that produces a derivative file under any
117 applicable law -- that is, a file containing the original file or
118 a significant portion of it, either verbatim or with modifications
119 and/or translated into another language.
120
121 Changing the name of a file (other than as necessitated by the file
122 conventions of the target file systems) is considered to be a
123 modification of the file.
124
125 The distribution conditions in this license do not have to be
126 applied to files that have been modified in accordance with the
127 above conditions. Note, however, that Condition 7. does apply to
128 any such modified file.
129
130 The conditions above are not intended to prohibit, and hence do not
131 apply to, the updating, by any method, of a file so that it becomes
132 identical to the latest version of that file of The Program.
133
134
135
136 A Recommendation on Modification Without Distribution
137 -----------------------------------------------------
138
139 It is wise never to modify a file of The Program, even for your own
140 personal use, without also meeting the above eight conditions for
141 distributing the modified file. While you might intend that such
142 modified files will never be distributed, often this will happen by
143 accident -- you may forget that you have modified the file; or it may
144 not occur to you when allowing others to access the modified file
145 that you are thus distributing it and violating the conditions of
146 this license. It is usually in your best interest to keep your copy
147 of The Program identical with the public one. Many programs provide
148 ways to control the behavior of that program without altering its
149 licensed files.
150
151
152 Additional Conditions on Individual Files of The Program
153 --------------------------------------------------------
154
155 An individual file of The Program may bear additional conditions that
156 supplement and/or supersede the conditions in this license if, and only
157 if, such additional conditions exclusively concern modification of the
158 file or distribution of a modified version of the file. The conditions
159 on individual files of The Program therefore may differ only with
160 respect to the kind and extent of modification of those files that
161 is allowed, and with respect to the distribution of modified versions
162 of those files.
163
164
165 Additional Conditions on LaTeX Software Files
166 ---------------------------------------------
167
168 If a file of The Program is intended to be used with LaTeX (that is,
169 if it is a LaTeX software file), then the following additional
170 conditions, which supplement and/or supersede the conditions
171 above, 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
193 Because of portability and exchangeability issues in LaTeX software,
194 The LaTeX3 Project deprecates the distribution of modified versions of
195 components of LaTeX or of generally available contributed code for them,
196 but such distribution can meet the conditions of this license.
197
198
199 NO WARRANTY
200 ===========
201
202 There is no warranty for The Program. Except when otherwise stated in
203 writing, The Copyright Holder provides The Program `as is', without
204 warranty of any kind, either expressed or implied, including, but not
205 limited to, the implied warranties of merchantability and fitness for
206 a particular purpose. The entire risk as to the quality and performance
207 of The Program is with you. Should The Program prove defective, you
208 assume the cost of all necessary servicing, repair, or correction.
209
210 In no event unless agreed to in writing will The Copyright Holder, or
211 any author named in the files of The Program, or any other party who may
212 distribute and/or modify The Program as permitted above, be liable to
213 you for damages, including any general, special, incidental or
214 consequential damages arising out of any use of The Program or out of
215 inability to use The Program (including, but not limited to, loss of
216 data, data being rendered inaccurate, or losses sustained by anyone as
217 a result of any failure of The Program to operate with any other
218 programs), even if The Copyright Holder or said author or said other
219 party has been advised of the possibility of such damages.
220
221
222 WHETHER AND HOW TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE
223 =========================================================
224
225 This section contains important instructions, examples, and
226 recommendations for authors who are considering distributing their
227 programs under this license. These authors are addressed as `you' in
228 this section.
229
230
231 Choosing This License or Another License
232 ----------------------------------------
233
234 If for any part of your program you want or need to use *distribution*
235 conditions that differ from those in this license, then do not refer to
236 this license anywhere in your program but instead distribute your
237 program under a different license. You may use the text of this license
238 as a model for your own license, but your license should not refer to
239 the LPPL or otherwise give the impression that your program is
240 distributed under the LPPL.
241
242 The document `modguide.tex' in the base LaTeX distribution explains
243 the motivation behind the conditions of this license. It explains,
244 for example, why distributing LaTeX under the GNU General Public
245 License (GPL) was considered inappropriate. Even if your program is
246 unrelated to LaTeX, the discussion in `modguide.tex' may still be
247 relevant, and authors intending to distribute their programs under any
248 license are encouraged to read it.
249
250
251 How to Use This License
252 -----------------------
253
254 To use this license, place in each of the files of your program both
255 an explicit copyright notice including your name and the year and also
256 a statement that the distribution and/or modification of the file is
257 constrained by the conditions in this license.
258
259 Here 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 1.2
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 1.2 or later is part of all distributions of LaTeX
270 % version 1999/12/01 or later.
271 %
272 % This program consists of the files pig.dtx and pig.ins
273
274 Given such a notice and statement in a file, the conditions given in
275 this license document would apply, with `The Program' referring to the
276 two files `pig.dtx' and `pig.ins', and `The Copyright Holder' referring
277 to the person `M. Y. Name'.
278
279
280 Important 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.

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