1VIM LICENSE 2 3I) There are no restrictions on distributing unmodified copies of Vim except 4 that they must include this license text. You can also distribute 5 unmodified parts of Vim, likewise unrestricted except that they must 6 include this license text. You are also allowed to include executables 7 that you made from the unmodified Vim sources, plus your own usage 8 examples and Vim scripts. 9 10II) It is allowed to distribute a modified (or extended) version of Vim, 11 including executables and/or source code, when the following four 12 conditions are met: 13 1) This license text must be included unmodified. 14 2) The modified Vim must be distributed in one of the following five ways: 15 a) If you make changes to Vim yourself, you must clearly describe in 16 the distribution how to contact you. When the maintainer asks you 17 (in any way) for a copy of the modified Vim you distributed, you 18 must make your changes, including source code, available to the 19 maintainer without fee. The maintainer reserves the right to 20 include your changes in the official version of Vim. What the 21 maintainer will do with your changes and under what license they 22 will be distributed is negotiable. If there has been no negotiation 23 then this license, or a later version, also applies to your changes. 24 The current maintainer is Bram Moolenaar <[email protected]>. If this 25 changes it will be announced in appropriate places (most likely 26 vim.sf.net, www.vim.org and/or comp.editors). When it is completely 27 impossible to contact the maintainer, the obligation to send him 28 your changes ceases. Once the maintainer has confirmed that he has 29 received your changes they will not have to be sent again. 30 b) If you have received a modified Vim that was distributed as 31 mentioned under a) you are allowed to further distribute it 32 unmodified, as mentioned at I). If you make additional changes the 33 text under a) applies to those changes. 34 c) Provide all the changes, including source code, with every copy of 35 the modified Vim you distribute. This may be done in the form of a 36 context diff. You can choose what license to use for new code you 37 add. The changes and their license must not restrict others from 38 making their own changes to the official version of Vim. 39 d) When you have a modified Vim which includes changes as mentioned 40 under c), you can distribute it without the source code for the 41 changes if the following three conditions are met: 42 - The license that applies to the changes permits you to distribute 43 the changes to the Vim maintainer without fee or restriction, and 44 permits the Vim maintainer to include the changes in the official 45 version of Vim without fee or restriction. 46 - You keep the changes for at least three years after last 47 distributing the corresponding modified Vim. When the maintainer 48 or someone who you distributed the modified Vim to asks you (in 49 any way) for the changes within this period, you must make them 50 available to him. 51 - You clearly describe in the distribution how to contact you. This 52 contact information must remain valid for at least three years 53 after last distributing the corresponding modified Vim, or as long 54 as possible. 55 e) When the GNU General Public License (GPL) applies to the changes, 56 you can distribute the modified Vim under the GNU GPL version 2 or 57 any later version. 58 3) A message must be added, at least in the output of the ":version" 59 command and in the intro screen, such that the user of the modified Vim 60 is able to see that it was modified. When distributing as mentioned 61 under 2)e) adding the message is only required for as far as this does 62 not conflict with the license used for the changes. 63 4) The contact information as required under 2)a) and 2)d) must not be 64 removed or changed, except that the person himself can make 65 corrections. 66 67III) If you distribute a modified version of Vim, you are encouraged to use 68 the Vim license for your changes and make them available to the 69 maintainer, including the source code. The preferred way to do this is 70 by e-mail or by uploading the files to a server and e-mailing the URL. 71 If the number of changes is small (e.g., a modified Makefile) e-mailing a 72 context diff will do. The e-mail address to be used is 73 <[email protected]> 74 75IV) It is not allowed to remove this license from the distribution of the Vim 76 sources, parts of it or from a modified version. You may use this 77 license for previous Vim releases instead of the license that they came 78 with, at your option. 79