Credits and Licences
Version 2026-10-26 · Effective 26 October 2026
Vukron is built with the work of others, used under the licences below. Thank you to everyone who made it.
Data
- Maps: © OpenStreetMap contributors. Map data is available under the Open Database License (ODbL), https://www.openstreetmap.org/copyright. Map images by OpenStreetMap France, https://www.openstreetmap.fr. Country from location: OpenStreetMap Nominatim.
- Weather: data from MET Norway (the Norwegian Meteorological Institute), https://api.met.no, under the Creative Commons Attribution 4.0 licence (CC BY 4.0). Vukron turns it into its own forecasts: the chance of rain where MET gives only an amount, UV under cloud, visibility in fog, and sunrise and sunset are worked out by Vukron, not MET.
- Country from IP address: IP Geolocation by DB-IP, https://db-ip.com, under the Creative Commons Attribution 4.0 licence (CC BY 4.0).
Pictures and icons
The Vukron logo, sport pictures, posters, films and icons are Vukron's own, made for Vukron (some with AI tools, ChatGPT and Higgsfield, whose terms give Vukron the right to use what it makes with them commercially; no real person is shown). Photos of venues are uploaded by the venues, who agree in the Business Terms that they hold the rights to them.
Fonts
- Anton — Copyright 2020 The Anton Project Authors (https://github.com/googlefonts/AntonFont)
- Manrope — Copyright 2019 The Manrope Project Authors (https://github.com/sharanda/manrope)
- JetBrains Mono — Copyright 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono)
All three are licensed under the SIL Open Font License, Version 1.1, printed in full at the end of this page.
Software
The Vukron app, website and servers use these open source components, each under its own licence:
| Component | Licence |
|---|---|
| .NET, ASP.NET Core, .NET MAUI, Entity Framework Core | MIT |
| CommunityToolkit.Mvvm | MIT |
| SkiaSharp | MIT |
| ZXing.Net.Maui (QR scanning) | MIT |
| QRCoder, Barcoder (pass codes) | MIT |
| Plugin.Firebase (push notifications) | MIT |
| Npgsql (PostgreSQL) | PostgreSQL License |
| Markdig | BSD 2-Clause |
| libphonenumber-csharp | Apache License 2.0 |
| MaxMind.Db | Apache License 2.0 |
| Azure SDKs for .NET | MIT |
| StackExchange.Redis | MIT |
| Swashbuckle | MIT |
| three.js (the sports globe) | MIT |
| Bootstrap, jQuery, jQuery Validation (admin pages) | MIT |
The MIT, BSD, PostgreSQL and Apache licences allow use in commercial products provided their copyright notices and licence texts stay with the software. The full texts are at https://opensource.org/license/mit, https://opensource.org/license/bsd-2-clause, https://opensource.org/license/postgresql and https://www.apache.org/licenses/LICENSE-2.0, and in each component's package.
SIL Open Font License, Version 1.1
This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is copied below, and is also available with a FAQ at: https://openfontlicense.org
PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide development of collaborative font projects, to support the font creation efforts of academic and linguistic communities, and to provide a free and open framework in which fonts may be shared and improved in partnership with others.
The OFL allows the licensed fonts to be used, studied, modified and redistributed freely as long as they are not sold by themselves. The fonts, including any derivative works, can be bundled, embedded, redistributed and/or sold with any software provided that any reserved names are not used by derivative works. The fonts and derivatives, however, cannot be released under any other type of license. The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives.
DEFINITIONS
"Font Software" refers to the set of files released by the Copyright Holder(s) under this license and clearly marked as such. This may include source files, build scripts and documentation.
"Reserved Font Name" refers to any names specified as such after the copyright statement(s).
"Original Version" refers to the collection of Font Software components as distributed by the Copyright Holder(s).
"Modified Version" refers to any derivative made by adding to, deleting, or substituting -- in part or in whole -- any of the components of the Original Version, by changing formats or by porting the Font Software to a new environment.
"Author" refers to any designer, engineer, programmer, technical writer or other person who contributed to the Font Software.
PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and unmodified copies of the Font Software, subject to the following conditions:
Neither the Font Software nor any of its individual components, in Original or Modified Versions, may be sold by itself.
Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license. These can be included either as stand-alone text files, human-readable headers or in the appropriate machine-readable metadata fields within text or binary files as long as those fields can be easily viewed by the user.
No Modified Version of the Font Software may use the Reserved Font Name(s) unless explicit written permission is granted by the corresponding Copyright Holder. This restriction only applies to the primary font name as presented to the users.
The name(s) of the Copyright Holder(s) and the Author(s) of the Font Software shall not be used to promote, endorse or advertise any Modified Version, except to acknowledge the contribution(s) of the Copyright Holder(s) and the Author(s) or with their explicit written permission.
The Font Software, modified or unmodified, in part or in whole, must be distributed entirely under this license, and must not be distributed under any other license. The requirement for fonts to remain under this license does not apply to any document created using the Font Software.
TERMINATION
This license becomes null and void if any of the above conditions are not met.
DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.