Software Libraries:
-------------------

Horizon uses code from the Independent JPEG Group (IJG) to decode jpegs (license can be found at: https://spdx.org/licenses/IJG.html).
Furthermore the following APIs/libraries are used:
- platform dependent APIs (from the operating system in use)
- Irrlicht 3D Engine (http://irrlicht.sourceforge.net/)
- STL (Standard Template Library)
- libcurl
- libjpeg-turbo
- indirectly any dependencies which are required by the libraries mentioned above

Databases:
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Horizon uses vector data (OSM-* packages) and tiles (Tiles-* packages) from the OpenStreetMap project.
© OpenStreetMap contributors, Base map and data from OpenStreetMap and OpenStreetMap Foundation.
The data is freely available under the Open Database License: https://www.openstreetmap.org/copyright .

Aviation chart data is originated in proprietary sources for Europe and most of the world (except NFDC for USA).

Images:
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All images (except the icons/logos of the application itself and images which contain trademarks and the following exceptions) can be used under the Creative Commons Attribution-Share Alike 4.0 International license (https://creativecommons.org/licenses/by-sa/4.0/).
Some images are based on other images from wikimedia, freestockphotos.biz and pixabay.com with compatible licenses.
In cases where an appropriate credit is required, credits and/or exceptions can be found below.

Exceptions/Credits:

The download map icon (downloadChartIcon.png) and the edit map icon (editChartIcon.png) are based on https://commons.wikimedia.org/wiki/File:Map-icon.svg with the following "Creative Commons Attribution-Share Alike 3.0 Unported" license: https://creativecommons.org/licenses/by-sa/3.0/deed.en
downloadChartIcon: Changes have been made to indicate that chart data is going to be downloaded when pressing a button which uses this icon.
editChartIcon: Changes have been made to indicated that the chart data can be edited after pressing a button which uses this icon.
The original author's nickname at wikipedia is "Loginname", his real name is unknown. The original title is "Map icon".
