PrimeTween is licensed under the Asset Store EULA:  
https://unity3d.com/legal/as_terms

In short, it's allowed to use and modify PrimeTween in products distributed in binary format (apps and games).
But it's not allowed to redistribute it or create derivative libraries based on PrimeTween.

To create other libraries that depend on PrimeTween, please refer to this forum post:  
https://forum.unity.com/threads/1479609/page-4#post-9587461

Copyright: Kyrylo Kuzyk 2023
