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.
Moons can't fly.
--> Lvl 5 FI Operator - Free Service <-- +++ Holocron Article +++
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.