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VIM LICENSE |
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I) There are no restrictions on distributing unmodified copies of Vim except |
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that they must include this license text. You can also distribute |
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unmodified parts of Vim, likewise unrestricted except that they must |
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include this license text. You are also allowed to include executables |
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that you made from the unmodified Vim sources, plus your own usage |
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examples and Vim scripts. |
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II) It is allowed to distribute a modified (or extended) version of Vim, |
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including executables and/or source code, when the following four |
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conditions are met: |
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1) This license text must be included unmodified. |
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2) The modified Vim must be distributed in one of the following five ways: |
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a) If you make changes to Vim yourself, you must clearly describe in |
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the distribution how to contact you. When the maintainer asks you |
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(in any way) for a copy of the modified Vim you distributed, you |
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must make your changes, including source code, available to the |
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maintainer without fee. The maintainer reserves the right to |
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include your changes in the official version of Vim. What the |
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maintainer will do with your changes and under what license they |
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will be distributed is negotiable. If there has been no negotiation |
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then this license, or a later version, also applies to your changes. |
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The current maintainer is Bram Moolenaar <Bram@vim.org>. If this |
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changes it will be announced in appropriate places (most likely |
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vim.sf.net, www.vim.org and/or comp.editors). When it is completely |
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impossible to contact the maintainer, the obligation to send him |
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your changes ceases. Once the maintainer has confirmed that he has |
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received your changes they will not have to be sent again. |
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b) If you have received a modified Vim that was distributed as |
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mentioned under a) you are allowed to further distribute it |
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unmodified, as mentioned at I). If you make additional changes the |
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text under a) applies to those changes. |
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c) Provide all the changes, including source code, with every copy of |
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the modified Vim you distribute. This may be done in the form of a |
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context diff. You can choose what license to use for new code you |
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add. The changes and their license must not restrict others from |
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making their own changes to the official version of Vim. |
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d) When you have a modified Vim which includes changes as mentioned |
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under c), you can distribute it without the source code for the |
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changes if the following three conditions are met: |
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- The license that applies to the changes permits you to distribute |
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the changes to the Vim maintainer without fee or restriction, and |
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permits the Vim maintainer to include the changes in the official |
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version of Vim without fee or restriction. |
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- You keep the changes for at least three years after last |
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distributing the corresponding modified Vim. When the maintainer |
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or someone who you distributed the modified Vim to asks you (in |
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any way) for the changes within this period, you must make them |
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available to him. |
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- You clearly describe in the distribution how to contact you. This |
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contact information must remain valid for at least three years |
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after last distributing the corresponding modified Vim, or as long |
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as possible. |
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e) When the GNU General Public License (GPL) applies to the changes, |
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you can distribute the modified Vim under the GNU GPL version 2 or |
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any later version. |
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3) A message must be added, at least in the output of the ":version" |
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command and in the intro screen, such that the user of the modified Vim |
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is able to see that it was modified. When distributing as mentioned |
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under 2)e) adding the message is only required for as far as this does |
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not conflict with the license used for the changes. |
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4) The contact information as required under 2)a) and 2)d) must not be |
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removed or changed, except that the person himself can make |
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corrections. |
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III) If you distribute a modified version of Vim, you are encouraged to use |
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the Vim license for your changes and make them available to the |
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maintainer, including the source code. The preferred way to do this is |
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by e-mail or by uploading the files to a server and e-mailing the URL. |
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If the number of changes is small (e.g., a modified Makefile) e-mailing a |
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context diff will do. The e-mail address to be used is |
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<maintainer@vim.org> |
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IV) It is not allowed to remove this license from the distribution of the Vim |
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sources, parts of it or from a modified version. You may use this |
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license for previous Vim releases instead of the license that they came |
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with, at your option. |