Not really, its stolen by people producing them in secret or looting a faction. Some of them are just really old when stealing was possible via Red Scenarios if I remember right. And many of them were simple given away from the DC holder faction or sold.
Jefsa's made it pretty clear that he wants all that delicious "restricted" tech to exist on the general R&D trees for each faction type. IE eventually anyone with the right faction type will be able to R&D an A-Wing or a TIE/ln etc.
As much as I want a VSD, I think it'd taste better to produce it myself.