[dartho]

There have been some questions previously about the Vbulletin license agreement and how this add-on may be use to break it. I've just found a post on Vbulletin.com HERE

1. Your forum is accessable from multiple domains but the content is the same for each link. This is OK and does not require multiple licenses. My site is an example of a multi-domain setup that is allowed:

http://www.mscclan.com/forum/
http://www.macsubculture.com/forum/
http://www.mac-gamer.com/forum/

Notice how each domain points to exactly the same content.
2. Your forum is accessable from multiple domains but each domain shows a different forum style. This is OK and does not require multiple licenses.
3. Your forum is accessable from multiple domains and your forums are configured to show/hide certain forums based on the domain. This is not OK and requires an active vBulletin license for each domain. In this situation the forums appear to have separate content thereby making them separate forums in the eyes of the license agreement. Your forum content needs to be the same for each domain in order to qualify as a single forum.

In essence, it would appear that no matter how you use this add-on, it will not break the license agreement.