Unreal Engine itself is proprietary software, and you must obtain a valid license from Epic Games to use it or any of the modifications this project makes directly to engine code.
The Angelscript library's source code and all modifications made directly to it in this project are distributed under the open-source zlib license.
The UnrealEngine-Angelscript plugin code in this project is distributed under the standard MIT open source license.
For more information on licensing, see the
LICENSE.md file contained within the UnrealEngine-Angelscript project's source.