Multiple forums using vbulletin?

[webmasterdigest]

Hi, I have an existing site at www.talktopics.com. I am thinking of changing it to vbulletin but have some questions regarding licensing issues and whether I am permitted to do what i intend to do.

Here's what i want to do:

1. Allow members at talktopics to instantly start their own 'Forum or group'. This forum will have it's own sub-categories. For example, a member who wants to talk about toyotas can create a group called toyota, and his forum would be at:

toyota.talktopics.com/

and he can have categories for that such as:

- Buying Toyotas
- Selling Toyotas
- Intro yourself as toyota fan
- etc
- etc

Now, my question really is two part:

1. Is it even possible with hacks to do this or is this really a silly question and is alreay build into vbulletin?

2. Would my sub-domain idea violate vbulletin's licensing as they could theoritically be considered as running multiple forums???