I'm not qualified to answer that.
My meager skills aren't at that level. I had thought it was- under the Mame license, but that's about all I think I know. Argrin at VPU would know, I think he does compile it for the Sam tables.
My guess is it's still open but they only want an "official" version out there, so there's not 10 different versions of VPinmame out there. My hypothesis anyway.
