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  1. The LaTeX Project Public License
  2. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
  3. LPPL Version 1.3c 2008-05-04
  4. Copyright 1999 2002-2008 LaTeX3 Project
  5. Everyone is allowed to distribute verbatim copies of this
  6. license document, but modification of it is not allowed.
  7. PREAMBLE
  8. ========
  9. The LaTeX Project Public License (LPPL) is the primary license under
  10. which the LaTeX kernel and the base LaTeX packages are distributed.
  11. You may use this license for any work of which you hold the copyright
  12. and which you wish to distribute. This license may be particularly
  13. suitable if your work is TeX-related (such as a LaTeX package), but
  14. it is written in such a way that you can use it even if your work is
  15. unrelated to TeX.
  16. The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE',
  17. below, gives instructions, examples, and recommendations for authors
  18. who are considering distributing their works under this license.
  19. This license gives conditions under which a work may be distributed
  20. and modified, as well as conditions under which modified versions of
  21. that work may be distributed.
  22. We, the LaTeX3 Project, believe that the conditions below give you
  23. the freedom to make and distribute modified versions of your work
  24. that conform with whatever technical specifications you wish while
  25. maintaining the availability, integrity, and reliability of
  26. that work. If you do not see how to achieve your goal while
  27. meeting these conditions, then read the document `cfgguide.tex'
  28. and `modguide.tex' in the base LaTeX distribution for suggestions.
  29. DEFINITIONS
  30. ===========
  31. In this license document the following terms are used:
  32. `Work'
  33. Any work being distributed under this License.
  34. `Derived Work'
  35. Any work that under any applicable law is derived from the Work.
  36. `Modification'
  37. Any procedure that produces a Derived Work under any applicable
  38. law -- for example, the production of a file containing an
  39. original file associated with the Work or a significant portion of
  40. such a file, either verbatim or with modifications and/or
  41. translated into another language.
  42. `Modify'
  43. To apply any procedure that produces a Derived Work under any
  44. applicable law.
  45. `Distribution'
  46. Making copies of the Work available from one person to another, in
  47. whole or in part. Distribution includes (but is not limited to)
  48. making any electronic components of the Work accessible by
  49. file transfer protocols such as FTP or HTTP or by shared file
  50. systems such as Sun's Network File System (NFS).
  51. `Compiled Work'
  52. A version of the Work that has been processed into a form where it
  53. is directly usable on a computer system. This processing may
  54. include using installation facilities provided by the Work,
  55. transformations of the Work, copying of components of the Work, or
  56. other activities. Note that modification of any installation
  57. facilities provided by the Work constitutes modification of the Work.
  58. `Current Maintainer'
  59. A person or persons nominated as such within the Work. If there is
  60. no such explicit nomination then it is the `Copyright Holder' under
  61. any applicable law.
  62. `Base Interpreter'
  63. A program or process that is normally needed for running or
  64. interpreting a part or the whole of the Work.
  65. A Base Interpreter may depend on external components but these
  66. are not considered part of the Base Interpreter provided that each
  67. external component clearly identifies itself whenever it is used
  68. interactively. Unless explicitly specified when applying the
  69. license to the Work, the only applicable Base Interpreter is a
  70. `LaTeX-Format' or in the case of files belonging to the
  71. `LaTeX-format' a program implementing the `TeX language'.
  72. CONDITIONS ON DISTRIBUTION AND MODIFICATION
  73. ===========================================
  74. 1. Activities other than distribution and/or modification of the Work
  75. are not covered by this license; they are outside its scope. In
  76. particular, the act of running the Work is not restricted and no
  77. requirements are made concerning any offers of support for the Work.
  78. 2. You may distribute a complete, unmodified copy of the Work as you
  79. received it. Distribution of only part of the Work is considered
  80. modification of the Work, and no right to distribute such a Derived
  81. Work may be assumed under the terms of this clause.
  82. 3. You may distribute a Compiled Work that has been generated from a
  83. complete, unmodified copy of the Work as distributed under Clause 2
  84. above, as long as that Compiled Work is distributed in such a way that
  85. the recipients may install the Compiled Work on their system exactly
  86. as it would have been installed if they generated a Compiled Work
  87. directly from the Work.
  88. 4. If you are the Current Maintainer of the Work, you may, without
  89. restriction, modify the Work, thus creating a Derived Work. You may
  90. also distribute the Derived Work without restriction, including
  91. Compiled Works generated from the Derived Work. Derived Works
  92. distributed in this manner by the Current Maintainer are considered to
  93. be updated versions of the Work.
  94. 5. If you are not the Current Maintainer of the Work, you may modify
  95. your copy of the Work, thus creating a Derived Work based on the Work,
  96. and compile this Derived Work, thus creating a Compiled Work based on
  97. the Derived Work.
  98. 6. If you are not the Current Maintainer of the Work, you may
  99. distribute a Derived Work provided the following conditions are met
  100. for every component of the Work unless that component clearly states
  101. in the copyright notice that it is exempt from that condition. Only
  102. the Current Maintainer is allowed to add such statements of exemption
  103. to a component of the Work.
  104. a. If a component of this Derived Work can be a direct replacement
  105. for a component of the Work when that component is used with the
  106. Base Interpreter, then, wherever this component of the Work
  107. identifies itself to the user when used interactively with that
  108. Base Interpreter, the replacement component of this Derived Work
  109. clearly and unambiguously identifies itself as a modified version
  110. of this component to the user when used interactively with that
  111. Base Interpreter.
  112. b. Every component of the Derived Work contains prominent notices
  113. detailing the nature of the changes to that component, or a
  114. prominent reference to another file that is distributed as part
  115. of the Derived Work and that contains a complete and accurate log
  116. of the changes.
  117. c. No information in the Derived Work implies that any persons,
  118. including (but not limited to) the authors of the original version
  119. of the Work, provide any support, including (but not limited to)
  120. the reporting and handling of errors, to recipients of the
  121. Derived Work unless those persons have stated explicitly that
  122. they do provide such support for the Derived Work.
  123. d. You distribute at least one of the following with the Derived Work:
  124. 1. A complete, unmodified copy of the Work;
  125. if your distribution of a modified component is made by
  126. offering access to copy the modified component from a
  127. designated place, then offering equivalent access to copy
  128. the Work from the same or some similar place meets this
  129. condition, even though third parties are not compelled to
  130. copy the Work along with the modified component;
  131. 2. Information that is sufficient to obtain a complete,
  132. unmodified copy of the Work.
  133. 7. If you are not the Current Maintainer of the Work, you may
  134. distribute a Compiled Work generated from a Derived Work, as long as
  135. the Derived Work is distributed to all recipients of the Compiled
  136. Work, and as long as the conditions of Clause 6, above, are met with
  137. regard to the Derived Work.
  138. 8. The conditions above are not intended to prohibit, and hence do not
  139. apply to, the modification, by any method, of any component so that it
  140. becomes identical to an updated version of that component of the Work as
  141. it is distributed by the Current Maintainer under Clause 4, above.
  142. 9. Distribution of the Work or any Derived Work in an alternative
  143. format, where the Work or that Derived Work (in whole or in part) is
  144. then produced by applying some process to that format, does not relax or
  145. nullify any sections of this license as they pertain to the results of
  146. applying that process.
  147. 10. a. A Derived Work may be distributed under a different license
  148. provided that license itself honors the conditions listed in
  149. Clause 6 above, in regard to the Work, though it does not have
  150. to honor the rest of the conditions in this license.
  151. b. If a Derived Work is distributed under a different license, that
  152. Derived Work must provide sufficient documentation as part of
  153. itself to allow each recipient of that Derived Work to honor the
  154. restrictions in Clause 6 above, concerning changes from the Work.
  155. 11. This license places no restrictions on works that are unrelated to
  156. the Work, nor does this license place any restrictions on aggregating
  157. such works with the Work by any means.
  158. 12. Nothing in this license is intended to, or may be used to, prevent
  159. complete compliance by all parties with all applicable laws.
  160. NO WARRANTY
  161. ===========
  162. There is no warranty for the Work. Except when otherwise stated in
  163. writing, the Copyright Holder provides the Work `as is', without
  164. warranty of any kind, either expressed or implied, including, but not
  165. limited to, the implied warranties of merchantability and fitness for a
  166. particular purpose. The entire risk as to the quality and performance
  167. of the Work is with you. Should the Work prove defective, you assume
  168. the cost of all necessary servicing, repair, or correction.
  169. In no event unless required by applicable law or agreed to in writing
  170. will The Copyright Holder, or any author named in the components of the
  171. Work, or any other party who may distribute and/or modify the Work as
  172. permitted above, be liable to you for damages, including any general,
  173. special, incidental or consequential damages arising out of any use of
  174. the Work or out of inability to use the Work (including, but not limited
  175. to, loss of data, data being rendered inaccurate, or losses sustained by
  176. anyone as a result of any failure of the Work to operate with any other
  177. programs), even if the Copyright Holder or said author or said other
  178. party has been advised of the possibility of such damages.
  179. MAINTENANCE OF THE WORK
  180. =======================
  181. The Work has the status `author-maintained' if the Copyright Holder
  182. explicitly and prominently states near the primary copyright notice in
  183. the Work that the Work can only be maintained by the Copyright Holder
  184. or simply that it is `author-maintained'.
  185. The Work has the status `maintained' if there is a Current Maintainer
  186. who has indicated in the Work that they are willing to receive error
  187. reports for the Work (for example, by supplying a valid e-mail
  188. address). It is not required for the Current Maintainer to acknowledge
  189. or act upon these error reports.
  190. The Work changes from status `maintained' to `unmaintained' if there
  191. is no Current Maintainer, or the person stated to be Current
  192. Maintainer of the work cannot be reached through the indicated means
  193. of communication for a period of six months, and there are no other
  194. significant signs of active maintenance.
  195. You can become the Current Maintainer of the Work by agreement with
  196. any existing Current Maintainer to take over this role.
  197. If the Work is unmaintained, you can become the Current Maintainer of
  198. the Work through the following steps:
  199. 1. Make a reasonable attempt to trace the Current Maintainer (and
  200. the Copyright Holder, if the two differ) through the means of
  201. an Internet or similar search.
  202. 2. If this search is successful, then enquire whether the Work
  203. is still maintained.
  204. a. If it is being maintained, then ask the Current Maintainer
  205. to update their communication data within one month.
  206. b. If the search is unsuccessful or no action to resume active
  207. maintenance is taken by the Current Maintainer, then announce
  208. within the pertinent community your intention to take over
  209. maintenance. (If the Work is a LaTeX work, this could be
  210. done, for example, by posting to comp.text.tex.)
  211. 3a. If the Current Maintainer is reachable and agrees to pass
  212. maintenance of the Work to you, then this takes effect
  213. immediately upon announcement.
  214. b. If the Current Maintainer is not reachable and the Copyright
  215. Holder agrees that maintenance of the Work be passed to you,
  216. then this takes effect immediately upon announcement.
  217. 4. If you make an `intention announcement' as described in 2b. above
  218. and after three months your intention is challenged neither by
  219. the Current Maintainer nor by the Copyright Holder nor by other
  220. people, then you may arrange for the Work to be changed so as
  221. to name you as the (new) Current Maintainer.
  222. 5. If the previously unreachable Current Maintainer becomes
  223. reachable once more within three months of a change completed
  224. under the terms of 3b) or 4), then that Current Maintainer must
  225. become or remain the Current Maintainer upon request provided
  226. they then update their communication data within one month.
  227. A change in the Current Maintainer does not, of itself, alter the fact
  228. that the Work is distributed under the LPPL license.
  229. If you become the Current Maintainer of the Work, you should
  230. immediately provide, within the Work, a prominent and unambiguous
  231. statement of your status as Current Maintainer. You should also
  232. announce your new status to the same pertinent community as
  233. in 2b) above.
  234. WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE
  235. ======================================================
  236. This section contains important instructions, examples, and
  237. recommendations for authors who are considering distributing their
  238. works under this license. These authors are addressed as `you' in
  239. this section.
  240. Choosing This License or Another License
  241. ----------------------------------------
  242. If for any part of your work you want or need to use *distribution*
  243. conditions that differ significantly from those in this license, then
  244. do not refer to this license anywhere in your work but, instead,
  245. distribute your work under a different license. You may use the text
  246. of this license as a model for your own license, but your license
  247. should not refer to the LPPL or otherwise give the impression that
  248. your work is distributed under the LPPL.
  249. The document `modguide.tex' in the base LaTeX distribution explains
  250. the motivation behind the conditions of this license. It explains,
  251. for example, why distributing LaTeX under the GNU General Public
  252. License (GPL) was considered inappropriate. Even if your work is
  253. unrelated to LaTeX, the discussion in `modguide.tex' may still be
  254. relevant, and authors intending to distribute their works under any
  255. license are encouraged to read it.
  256. A Recommendation on Modification Without Distribution
  257. -----------------------------------------------------
  258. It is wise never to modify a component of the Work, even for your own
  259. personal use, without also meeting the above conditions for
  260. distributing the modified component. While you might intend that such
  261. modifications will never be distributed, often this will happen by
  262. accident -- you may forget that you have modified that component; or
  263. it may not occur to you when allowing others to access the modified
  264. version that you are thus distributing it and violating the conditions
  265. of this license in ways that could have legal implications and, worse,
  266. cause problems for the community. It is therefore usually in your
  267. best interest to keep your copy of the Work identical with the public
  268. one. Many works provide ways to control the behavior of that work
  269. without altering any of its licensed components.
  270. How to Use This License
  271. -----------------------
  272. To use this license, place in each of the components of your work both
  273. an explicit copyright notice including your name and the year the work
  274. was authored and/or last substantially modified. Include also a
  275. statement that the distribution and/or modification of that
  276. component is constrained by the conditions in this license.
  277. Here is an example of such a notice and statement:
  278. %% pig.dtx
  279. %% Copyright 2005 M. Y. Name
  280. %
  281. % This work may be distributed and/or modified under the
  282. % conditions of the LaTeX Project Public License, either version 1.3
  283. % of this license or (at your option) any later version.
  284. % The latest version of this license is in
  285. % http://www.latex-project.org/lppl.txt
  286. % and version 1.3 or later is part of all distributions of LaTeX
  287. % version 2005/12/01 or later.
  288. %
  289. % This work has the LPPL maintenance status `maintained'.
  290. %
  291. % The Current Maintainer of this work is M. Y. Name.
  292. %
  293. % This work consists of the files pig.dtx and pig.ins
  294. % and the derived file pig.sty.
  295. Given such a notice and statement in a file, the conditions
  296. given in this license document would apply, with the `Work' referring
  297. to the three files `pig.dtx', `pig.ins', and `pig.sty' (the last being
  298. generated from `pig.dtx' using `pig.ins'), the `Base Interpreter'
  299. referring to any `LaTeX-Format', and both `Copyright Holder' and
  300. `Current Maintainer' referring to the person `M. Y. Name'.
  301. If you do not want the Maintenance section of LPPL to apply to your
  302. Work, change `maintained' above into `author-maintained'.
  303. However, we recommend that you use `maintained', as the Maintenance
  304. section was added in order to ensure that your Work remains useful to
  305. the community even when you can no longer maintain and support it
  306. yourself.
  307. Derived Works That Are Not Replacements
  308. ---------------------------------------
  309. Several clauses of the LPPL specify means to provide reliability and
  310. stability for the user community. They therefore concern themselves
  311. with the case that a Derived Work is intended to be used as a
  312. (compatible or incompatible) replacement of the original Work. If
  313. this is not the case (e.g., if a few lines of code are reused for a
  314. completely different task), then clauses 6b and 6d shall not apply.
  315. Important Recommendations
  316. -------------------------
  317. Defining What Constitutes the Work
  318. The LPPL requires that distributions of the Work contain all the
  319. files of the Work. It is therefore important that you provide a
  320. way for the licensee to determine which files constitute the Work.
  321. This could, for example, be achieved by explicitly listing all the
  322. files of the Work near the copyright notice of each file or by
  323. using a line such as:
  324. % This work consists of all files listed in manifest.txt.
  325. in that place. In the absence of an unequivocal list it might be
  326. impossible for the licensee to determine what is considered by you
  327. to comprise the Work and, in such a case, the licensee would be
  328. entitled to make reasonable conjectures as to which files comprise
  329. the Work.