As per the forum description, this should be asked on vBulletin.com, they are the only ones (or in a sales/support ticket) who can give an official answer.
Quote:
Questions regarding default vBulletin functionality or licensing and pricing should be asked on the Official company website: vBulletin Pre-sales Questions
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But to answer your questions: vBulletin does not censor domainnames in normal situations.
An no, as per the
License Agreement you are only allowed to use a license on a single installation.