I don't have Vickie II yet, but as I understand it, she is just a CR2 that morphs the original geometry and has new joint parameters. So DAZ is just protecting what they sell. Vickie II is just a character, as I understand it, and it would be unethical to base a character on somebody elses character anyway, as you would be using their work without compensation. As an example of the difference, Supermodel Vickie isn't a character, she has a different object file, so you could sell a character based on SMV. Anyway, bear in mind that any character that is sold through DAZ based on Vickie II is going to cost more than the Vickie II upgrade, as you will be getting her as part of the package.