RPG Toolkit audio resorce license>?, rpg maker toolkit music Options

[TheOnlyPKMNmaste...]

Hello,
I am working with a friend on a game.
At the beginning, we thought it was going to be freeware, so I didn't bother looking at licenses.
However, recently, we have decided that this game warents comercialization.
So, we are collecting free and non-free music tracks for the game.
The prison complex uses the vip - dungeon1 MID file, and if the rmtk resources are royalty free for comercial use, we may use others like it.
My question is, what is the license for rmtk resources? I have been looking around for this for about 2.5 weeks.