1 2LaTeX Project Public License 3============================ 4 5LPPL Version 1.0 1999-03-01 6 7Copyright 1999 LaTeX3 Project 8 Everyone is permitted to copy and distribute verbatim copies 9 of this license document, but modification is not allowed. 10 11 12Preamble 13======== 14 15The LaTeX Project Public License (LPPL) is the license under which the 16base LaTeX distribution is distributed. As described below you may use 17this licence for any software that you wish to distribute. 18 19It may be particularly suitable if your software is TeX related (such 20as a LaTeX package file) but it may be used for any software, even if 21it is unrelated to TeX. 22 23To use this license, the files of your distribution should have an 24explicit copyright notice giving your name and the year, together 25with a reference to this license. 26 27A typical example would be 28 29 %% pig.sty 30 %% Copyright 2001 M. Y. Name 31 32 % This program can redistributed and/or modified under the terms 33 % of the LaTeX Project Public License Distributed from CTAN 34 % archives in directory macros/latex/base/lppl.txt; either 35 % version 1 of the License, or (at your option) any later version. 36 37Given such a notice in the file, the conditions of this document would 38apply, with: 39 40`The Program` referring to the software `pig.sty` and 41`The Copyright Holder` referring to the person `M. Y. Name`. 42 43To see a real example, see the file legal.txt which carries the 44copyright notice for the base latex distribution. 45 46This license gives terms under which files of The Program may be 47distributed and modified. Individual files may have specific further 48constraints on modification, but no file should have restrictions on 49distribution other than those specified below. 50This is to ensure that a distributor wishing to distribute a complete 51unmodified copy of The Program need only check the conditions in this 52file, and does not need to check every file in The Program for extra 53restrictions. If you do need to modify the distribution terms of some 54files, do not refer to this license, instead distribute The Program 55under a different license. You may use the parts of the text of LPPL as 56a model for your own license, but your license should not directly refer 57to the LPPL or otherwise give the impression that The Program is 58distributed under the LPPL. 59 60 61 62The LaTeX Project Public License 63================================ 64Terms And Conditions For Copying, Distribution And Modification 65=============================================================== 66 67 68WARRANTY 69======== 70 71There is no warranty for The Program, to the extent permitted by 72applicable law. Except when otherwise stated in writing, The 73Copyright Holder provides The Program `as is` without warranty of any 74kind, either expressed or implied, including, but not limited to, the 75implied warranties of merchantability and fitness for a particular 76purpose. The entire risk as to the quality and performance of the 77program is with you. Should The Program prove defective, you assume 78the cost of all necessary servicing, repair or correction. 79 80In no event unless required by applicable law or agreed to in writing 81will The Copyright Holder, or any of the individual authors named in 82the source for The Program, be liable to you for damages, including 83any general, special, incidental or consequential damages arising out 84of any use of The Program or out of inability to use The Program 85(including but not limited to loss of data or data being rendered 86inaccurate or losses sustained by you or by third parties as a result 87of a failure of The Program to operate with any other programs), even 88if such holder or other party has been advised of the possibility of 89such damages. 90 91 92DISTRIBUTION 93============ 94 95Redistribution of unchanged files is allowed provided that all files 96that make up the distribution of The Program are distributed. 97In particular this means that The Program has to be distributed 98including its documentation if documentation was part of the original 99distribution. 100 101The distribution of The Program will contain a prominent file 102listing all the files covered by this license. 103 104If you receive only some of these files from someone, complain! 105 106The distribution of changed versions of certain files included in the 107The Program, and the reuse of code from The Program, are allowed 108under the following restrictions: 109 110 * It is allowed only if the legal notice in the file does not 111 expressly forbid it. 112 See note below, under "Conditions on individual files". 113 114 * You rename the file before you make any changes to it, unless the 115 file explicitly says that renaming is not required. Any such changed 116 files must be distributed under a license that forbids distribution 117 of those files, and any files derived from them, under the names used 118 by the original files in the distribution of The Program. 119 120 * You change any `identification string` in The Program to clearly 121 indicate that the file is not part of the standard system. 122 123 * If The Program includes an `error report address` so that errors 124 may be reported to The Copyright Holder, or other specified 125 addresses, this address must be changed in any modified versions of 126 The Program, so that reports for files not maintained by the 127 original program maintainers are directed to the maintainers of the 128 changed files. 129 130 * You acknowledge the source and authorship of the original version 131 in the modified file. 132 133 * You also distribute the unmodified version of the file or 134 alternatively provide sufficient information so that the 135 user of your modified file can be reasonably expected to be 136 able to obtain an original, unmodified copy of The Program. 137 For example, you may specify a URL to a site that you expect 138 will freely provide the user with a copy of The Program (either 139 the version on which your modification is based, or perhaps a 140 later version). 141 142 * If The Program is intended to be used with, or is based on, LaTeX, 143 then files with the following file extensions which have special 144 meaning in LaTeX Software, have special modification rules under the 145 license: 146 147 - Files with extension `.ins` (installation files): these files may 148 not be modified at all because they contain the legal notices 149 that are placed in the generated files. 150 151 - Files with extension `.fd` (LaTeX font definitions files): these 152 files are allowed to be modified without changing the name, but 153 only to enable use of all available fonts and to prevent attempts 154 to access unavailable fonts. However, modified files are not 155 allowed to be distributed in place of original files. 156 157 - Files with extension `.cfg` (configuration files): these files 158 can be created or modified to enable easy configuration of the 159 system. The documentation in cfgguide.tex in the base LaTeX 160 distribution describes when it makes sense to modify or generate 161 such files. 162 163 164The above restrictions are not intended to prohibit, and hence do 165not apply to, the updating, by any method, of a file so that it 166becomes identical to the latest version of that file in The Program. 167 168======================================================================== 169 170NOTES 171===== 172 173We believe that these requirements give you the freedom you to make 174modifications that conform with whatever technical specifications you 175wish, whilst maintaining the availability, integrity and reliability of 176The Program. If you do not see how to achieve your goal whilst 177adhering to these requirements then read the document cfgguide.tex 178in the base LaTeX distribution for suggestions. 179 180Because of the portability and exchangeability aspects of systems 181like LaTeX, The LaTeX3 Project deprecates the distribution of 182non-standard versions of components of LaTeX or of generally available 183contributed code for them but such distributions are permitted under the 184above restrictions. 185 186The document modguide.tex in the base LaTeX distribution details 187the reasons for the legal requirements detailed above. 188Even if The Program is unrelated to LaTeX, the argument in 189modguide.tex may still apply, and should be read before 190a modified version of The Program is distributed. 191 192 193Conditions on individual files 194============================== 195 196The individual files may bear additional conditions which supersede 197the general conditions on distribution and modification contained in 198this file. If there are any such files, the distribution of The 199Program will contain a prominent file that lists all the exceptional 200files. 201 202Typical examples of files with more restrictive modification 203conditions would be files that contain the text of copyright notices. 204 205 * The conditions on individual files differ only in the 206 extent of *modification* that is allowed. 207 208 * The conditions on *distribution* are the same for all the files. 209 Thus a (re)distributor of a complete, unchanged copy of The Program 210 need meet only the conditions in this file; it is not necessary to 211 check the header of every file in the distribution to check that a 212 distribution meets these requirements. 213 214