1LaTeX Project Public License 2============================ 3 4LPPL Version 1.0 1999-03-01 5 6Copyright 1999 LaTeX3 Project 7 Everyone is permitted to copy and distribute verbatim copies 8 of this license document, but modification is not allowed. 9 10 11Preamble 12======== 13 14The LaTeX Project Public License (LPPL) is the license under which the 15base LaTeX distribution is distributed. As described below you may use 16this licence for any software that you wish to distribute. 17 18It may be particularly suitable if your software is TeX related (such 19as a LaTeX package file) but it may be used for any software, even if 20it is unrelated to TeX. 21 22To use this license, the files of your distribution should have an 23explicit copyright notice giving your name and the year, together 24with a reference to this license. 25 26A typical example would be 27 28 %% pig.sty 29 %% Copyright 2001 M. Y. Name 30 31 % This program can redistributed and/or modified under the terms 32 % of the LaTeX Project Public License Distributed from CTAN 33 % archives in directory macros/latex/base/lppl.txt; either 34 % version 1 of the License, or (at your option) any later version. 35 36Given such a notice in the file, the conditions of this document would 37apply, with: 38 39`The Program' referring to the software `pig.sty' and 40`The Copyright Holder' referring to the person `M. Y. Name'. 41 42To see a real example, see the file legal.txt which carries the 43copyright notice for the base latex distribution. 44 45This license gives terms under which files of The Program may be 46distributed and modified. Individual files may have specific further 47constraints on modification, but no file should have restrictions on 48distribution other than those specified below. 49This is to ensure that a distributor wishing to distribute a complete 50unmodified copy of The Program need only check the conditions in this 51file, and does not need to check every file in The Program for extra 52restrictions. If you do need to modify the distribution terms of some 53files, do not refer to this license, instead distribute The Program 54under a different license. You may use the parts of the text of LPPL as 55a model for your own license, but your license should not directly refer 56to the LPPL or otherwise give the impression that The Program is 57distributed under the LPPL. 58 59 60 61The LaTeX Project Public License 62================================ 63Terms And Conditions For Copying, Distribution And Modification 64=============================================================== 65 66 67WARRANTY 68======== 69 70There is no warranty for The Program, to the extent permitted by 71applicable law. Except when otherwise stated in writing, The 72Copyright Holder provides The Program `as is' without warranty of any 73kind, either expressed or implied, including, but not limited to, the 74implied warranties of merchantability and fitness for a particular 75purpose. The entire risk as to the quality and performance of the 76program is with you. Should The Program prove defective, you assume 77the cost of all necessary servicing, repair or correction. 78 79In no event unless required by applicable law or agreed to in writing 80will The Copyright Holder, or any of the individual authors named in 81the source for The Program, be liable to you for damages, including 82any general, special, incidental or consequential damages arising out 83of any use of The Program or out of inability to use The Program 84(including but not limited to loss of data or data being rendered 85inaccurate or losses sustained by you or by third parties as a result 86of a failure of The Program to operate with any other programs), even 87if such holder or other party has been advised of the possibility of 88such damages. 89 90 91DISTRIBUTION 92============ 93 94Redistribution of unchanged files is allowed provided that all files 95that make up the distribution of The Program are distributed. 96In particular this means that The Program has to be distributed 97including its documentation if documentation was part of the original 98distribution. 99 100The distribution of The Program will contain a prominent file 101listing all the files covered by this license. 102 103If you receive only some of these files from someone, complain! 104 105The distribution of changed versions of certain files included in the 106The Program, and the reuse of code from The Program, are allowed 107under the following restrictions: 108 109 * It is allowed only if the legal notice in the file does not 110 expressly forbid it. 111 See note below, under "Conditions on individual files". 112 113 * You rename the file before you make any changes to it, unless the 114 file explicitly says that renaming is not required. Any such changed 115 files must be distributed under a license that forbids distribution 116 of those files, and any files derived from them, under the names used 117 by the original files in the distribution of The Program. 118 119 * You change any `identification string' in The Program to clearly 120 indicate that the file is not part of the standard system. 121 122 * If The Program includes an `error report address' so that errors 123 may be reported to The Copyright Holder, or other specified 124 addresses, this address must be changed in any modified versions of 125 The Program, so that reports for files not maintained by the 126 original program maintainers are directed to the maintainers of the 127 changed files. 128 129 * You acknowledge the source and authorship of the original version 130 in the modified file. 131 132 * You also distribute the unmodified version of the file or 133 alternatively provide sufficient information so that the 134 user of your modified file can be reasonably expected to be 135 able to obtain an original, unmodified copy of The Program. 136 For example, you may specify a URL to a site that you expect 137 will freely provide the user with a copy of The Program (either 138 the version on which your modification is based, or perhaps a 139 later version). 140 141 * If The Program is intended to be used with, or is based on, LaTeX, 142 then files with the following file extensions which have special 143 meaning in LaTeX Software, have special modification rules under the 144 license: 145 146 - Files with extension `.ins' (installation files): these files may 147 not be modified at all because they contain the legal notices 148 that are placed in the generated files. 149 150 - Files with extension `.fd' (LaTeX font definitions files): these 151 files are allowed to be modified without changing the name, but 152 only to enable use of all available fonts and to prevent attempts 153 to access unavailable fonts. However, modified files are not 154 allowed to be distributed in place of original files. 155 156 - Files with extension `.cfg' (configuration files): these files 157 can be created or modified to enable easy configuration of the 158 system. The documentation in cfgguide.tex in the base LaTeX 159 distribution describes when it makes sense to modify or generate 160 such files. 161 162 163The above restrictions are not intended to prohibit, and hence do 164not apply to, the updating, by any method, of a file so that it 165becomes identical to the latest version of that file in The Program. 166 167======================================================================== 168 169NOTES 170===== 171 172We believe that these requirements give you the freedom you to make 173modifications that conform with whatever technical specifications you 174wish, whilst maintaining the availability, integrity and reliability of 175The Program. If you do not see how to achieve your goal whilst 176adhering to these requirements then read the document cfgguide.tex 177in the base LaTeX distribution for suggestions. 178 179Because of the portability and exchangeability aspects of systems 180like LaTeX, The LaTeX3 Project deprecates the distribution of 181non-standard versions of components of LaTeX or of generally available 182contributed code for them but such distributions are permitted under the 183above restrictions. 184 185The document modguide.tex in the base LaTeX distribution details 186the reasons for the legal requirements detailed above. 187Even if The Program is unrelated to LaTeX, the argument in 188modguide.tex may still apply, and should be read before 189a modified version of The Program is distributed. 190 191 192Conditions on individual files 193============================== 194 195The individual files may bear additional conditions which supersede 196the general conditions on distribution and modification contained in 197this file. If there are any such files, the distribution of The 198Program will contain a prominent file that lists all the exceptional 199files. 200 201Typical examples of files with more restrictive modification 202conditions would be files that contain the text of copyright notices. 203 204 * The conditions on individual files differ only in the 205 extent of *modification* that is allowed. 206 207 * The conditions on *distribution* are the same for all the files. 208 Thus a (re)distributor of a complete, unchanged copy of The Program 209 need meet only the conditions in this file; it is not necessary to 210 check the header of every file in the distribution to check that a 211 distribution meets these requirements. 212