X-Git-Url: http://git.meshlink.io/?p=meshlink;a=blobdiff_plain;f=COPYING.README;h=214af7513c0968012e4c63d9e0f124a4aa133005;hp=2eb9c1facc212244a4103f9f9b81149c6f6a9d44;hb=4b6c01b1d5383b1a7417244a31ad4652aab2d5db;hpb=f7b2a2ea43fca323f543e152e6a43a29a4eb6671 diff --git a/COPYING.README b/COPYING.README index 2eb9c1fa..214af751 100644 --- a/COPYING.README +++ b/COPYING.README @@ -1,19 +1,116 @@ -The following applies to tinc: +# License obligations -This program is released under the GPL with the additional exemption that -compiling, linking, and/or using OpenSSL is allowed. You may provide binary -packages linked to the OpenSSL libraries, provided that all other requirements -of the GPL are met. +The source code of the MeshLink library itself is licensed under the GNU +General Public License version 2 or later (see the file COPYING for the +complete license). However, the MeshLink library depends on other libraries as +well, which each have their own license. This document summarizes your +obligations when you are releasing binaries that link with the MeshLink library +and any dependent libraries, for both open source and closed source software. -The following applies to the LZO library: +Please note that this document is not to be interpreted as a license itself. - Hereby I grant a special exception to the tinc VPN project - (http://tinc.nl.linux.org/) to link the LZO library with the OpenSSL library - (http://www.openssl.org). +## List of libraries that MeshLink depends on - Markus F.X.J. Oberhumer +* Catta (LGPL version 2.1) +* Ed25519 (zlib license) +* Chacha20-Poly1305 (public domain) -When tinc is compiled with the --enable-tunemu option, the resulting binary -falls under the GPL version 3 or later. +## Obligations for closed source software +With closed source software, we mean any software that is distributed only in +binary form. Note that there is no distinction between software that is sold, +rented out, or is gratis. You are not allowed to distribute closed source +software linked to the MeshLink library unless you have obtained a commercial +license for the MeshLink library. If you do distribute closed source software +linked to MeshLink without a commercial license, you are violating +international copyright law. In this case, please contact the MeshLink +author(s) as soon as possible in order to remedy this situation. +If you do have a commercial license for the MeshLink library, then apart from +the obligations set out in the commercial license, you are also obligated to +follow the rules set out in the licenses of the libraries MeshLink depends on. +In short, these are: + +* Unless you have compiled MeshLink without support for Catta, you must make + the source code of Catta, with any modifications that you made to the Catta + library itself, available on request to anyone who has received a copy of + your closed source software, under the terms of the GNU Lesser General Public + License version 2.1 or later. +* Unless you have compiled MeshLink without support for Catta, you must give + prominent notice with each copy of your software that your software is using + Catta, and that the Catta library itself is covered under the terms of the + GNU Lesser General Public License version 2.1. + +Apart from these obligations, you are strongly recommended to mention the other +libraries that MeshLink is depending on, as well as mention the MeshLink +library itself: + +* Attribute Orson Peters as the author of the Ed25519 library. +* Attribute Daniel J. Bernstein as the author of the Chacha20-Poly1305 library. +* Attribute Guus Sliepen as the author of the MeshLink library. + +## Obligations for open source software + +With open source software, we mean any software that is distributed in source +form, or is distributed in binary form with the exact source code used to +compile the binary form made publicly available, or with this source code +made available on request. Note that there is no distinction between software +that is sold, rented out, or is gratis. + +If your software itself does not contain any copies or excerpts of the source +code of MeshLink, you are free to distribute that software under any license +you want. However, as soon as you distribute any binaries that are linked with +MeshLink, then the resulting binaries can only be distributed under the terms +of the GNU General Public License version 2 or later. In practice, this is not +a problem since if you make the source code available publicly, you are +fulfilling the obligations of the GPL, unless your software has a software +license that is incompatible with the GPL. Please check the following website +to find out if your open source software is compatible with MeshLink: + +https://www.gnu.org/licenses/license-list.en.html#SoftwareLicenses + +Apart from the obligations for the MeshLink library, set out in the GPL, you +are also obligated to follow the rules set out in the licenses of the libraries +MeshLink depends on. In short, these are: + +* Unless you have compiled MeshLink without support for Catta, you must make + the source code of Catta, with any modifications that you made to the Catta + library itself, available on request to anyone who has received a copy of + your closed source software, under the terms of the GNU Lesser General Public + License version 2.1 or later. +* Unless you have compiled MeshLink without support for Catta, you must give + prominent notice with each copy of your software that your software is using + Catta, and that the Catta library itself is covered under the terms of the + GNU Lesser General Public License version 2.1. + +Apart from these obligations, you are strongly recommended to mention the other +libraries that MeshLink is depending on, as well as mention the MeshLink +library itself: + +* Attribute Orson Peters as the author of the Ed25519 library. +* Attribute Daniel J. Bernstein as the author of the Chacha20-Poly1305 library. +* Attribute Guus Sliepen as the author of the MeshLink library. + +## Recommended attribution text + +Attribution for the libraries your software depends on should be added to any +written, printed or electronic documentation that comes with your software, as +well as displayed in any about dialogs, splash screens, and any other forms of +display that contain credits, license information and/or attribution. The +recommended text to display is: + + This software makes use of the following libraries: + + - MeshLink, copyright © 2014-2018 Guus Sliepen, + licensed under the GPL version 2 or later¹ + - Catta, copyright © 2004-2018 the Avahi Developers and others, + licensed under the LGPL version 2.1 or later² + - Chacha20-Poly1305, by Daniel J. Bernstein, public domain + - Ed25519, copyright © 2015 Orson Peters, licensed under the zlib license + +¹) omit the "licensed under" text if you have a commercial license +²) omit this is you compiled MeshLink without support for Catta + +The full text of the licenses of all libraries used should be included in the +documentation, and should be included in any forms or displays that contain +license information.