Kane’s Advocacy is made using a bought copy of RPG Maker VX and almost entirely the original RTP (all the graphics, sound and music in the game, though where to put them was done by me). I did use a few scripts and pictures which are allowed to be used commercially. They are listed here.
I am also legally using the pre-order bonus materials from RPG Maker VX Ace. (C) 2012 ENTERBRAIN, INC.