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| 1 | +VIM LICENSE |
| 2 | + |
| 3 | +I) 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 | + |
| 10 | +II) 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 | + |
| 67 | +III) 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 | + |
| 74 | + |
| 75 | +IV) 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. |
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