3.10 Can I sell my VCDS System to someone else?
You can sell the Interface, but PC-based activations and support are not transferable.
All of our Current Interfaces act as "dongles" for VCDS, so the software should be fully functional on any PC that meets our requirements. However, we only provide support to the original owner. If you sell your interface to a third party and that person wants to be a "registered user" (eligible for product support and upgrades), he will have to register with us for $99 here.
Ross-Tech: FAQ Page 3