1VIM LICENSE 2 3I) There are no restrictions on distributing unmodified copies of Vim except 4that they must include this license text. You can also distribute unmodified 5parts of Vim , likewise unrestricted except that they must include this license 6text. You are also allowed to include executables that you made from the unmodified 7Vim sources, plus your own usage examples and Vim scripts. 8 9II) It is allowed to distribute a modified (or extended) version of Vim , 10including executables and/or source code, when the following four conditions 11are met: 12 13 1) This license text must be included unmodified. 14 152) The modified Vim must be distributed in one of the following five ways: 16 17a) If you make changes to Vim yourself, you must clearly describe in the distribution 18how to contact you. When the maintainer asks you (in any way) for a copy of 19the modified Vim you distributed, you must make your changes, including source 20code, available to the maintainer without fee. The maintainer reserves the 21right to include your changes in the official version of Vim . What the maintainer 22will do with your changes and under what license they will be distributed 23is negotiable. If there has been no negotiation then this license, or a later 24version, also applies to your changes. The current maintainer is Bram Moolenaar 25<Bram@vim.org>. If this changes it will be announced in appropriate places 26(most likely vim.sf.net, www.vim.org and/or comp.editors). When it is completely 27impossible to contact the maintainer, the obligation to send him your changes 28ceases. Once the maintainer has confirmed that he has received your changes 29they will not have to be sent again. 30 31b) If you have received a modified Vim that was distributed as mentioned under 32a) you are allowed to further distribute it unmodified, as mentioned at I). 33If you make additional changes the text under a) applies to those changes. 34 35c) Provide all the changes, including source code, with every copy of the 36modified Vim you distribute. This may be done in the form of a context diff. 37You can choose what license to use for new code you add. The changes and their 38license must not restrict others from making their own changes to the official 39version of Vim . 40 41d) When you have a modified Vim which includes changes as mentioned under 42c), you can distribute it without the source code for the changes if the following 43three conditions are met: 44 45- The license that applies to the changes permits you to distribute the changes 46to the Vim maintainer without fee or restriction, and permits the Vim maintainer 47to include the changes in the official version of Vim without fee or restriction. 48 49- You keep the changes for at least three years after last distributing the 50corresponding modified Vim . When the maintainer or someone who you distributed 51the modified Vim to asks you (in any way) for the changes within this period, 52you must make them available to him. 53 54- You clearly describe in the distribution how to contact you. This contact 55information must remain valid for at least three years after last distributing 56the corresponding modified Vim , or as long as possible. 57 58e) When the GNU General Public License (GPL) applies to the changes, you can 59distribute the modified Vim under the GNU GPL version 2 or any later version. 60 613) A message must be added, at least in the output of the ":version" command 62and in the intro screen, such that the user of the modified Vim is able to 63see that it was modified. When distributing as mentioned under 2)e) adding 64the message is only required for as far as this does not conflict with the 65license used for the changes. 66 674) The contact information as required under 2)a) and 2)d) must not be removed 68or changed, except that the person himself can make corrections. 69 70III) If you distribute a modified version of Vim , you are encouraged to use 71the Vim license for your changes and make them available to the maintainer, 72including the source code. The preferred way to do this is by e-mail or by 73uploading the files to a server and e-mailing the URL. If the number of changes 74is small (e.g., a modified Makefile) e-mailing a context diff will do. The 75e-mail address to be used is <maintainer@vim.org> 76 77IV) It is not allowed to remove this license from the distribution of the 78Vim sources, parts of it or from a modified version. You may use this license 79for previous Vim releases instead of the license that they came with, at your 80option. 81