How to get UDK Licence for release a Free PS Vita Game?

Thanks bro, I may consider so porting to UE4. I know that a studio called Armature Game Studios (it is formed by some guys who worked on Metroid Prime Series) is porting Unreal Engine 4 to PS Vita and Wii U, because they are going to make the Wii U and Vita Versions of the Game Bloodstained (the new castlevania), and already told officially that they are going to give the PS Vita and Wii U Source Code for UE4 to registered developers for free.

So it may be a good idea.

Thanks.