1) Can be used for commercial or non commercial use.
2) Intended for Visual Novel Maker, but can be used in any engine.
3) Can edit resources.
4) Cannot redistribute work on different websites without permission.
5) Must credit Kory Toombs somewhere in your game.
If you use in VN Maker you must import the resources into the engine. Some modification to the action UI system required. Not difficult to use, but may require some software knowledge.