Hi,
If you send them an email with the hardware code, they will provide you with a serial number.
They will even send you extra codes if you use more than one PC.
Another thing I can say about 3D Brush is just how helpful and responsive Andrew and the rest of the guys are. They answer every query and have even changed aspects of the program at the request of the users.
One of the things that keeps me using 3D Gamestudio is the strong sense of community and I believe 3D Brush has the same kind of feel to it.
Marc Wakefield
http://www.marcwakefield.co.uk