If he only has 1 license, which I assume thats the case, then yes that would be a violation of the license agreement.
Quote:
vBulletin licence grants you the right to run one instance (a single installation) of the Software on one web server and one web site for each licence purchased. Each licence may power one instance of the Software on one domain. For each installed instance of the Software, a separate licence is required. Modifications to the software or database to circumvent the one-license-one-board rule are prohibited.
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Unless I am mistaken by that statement... Would not be the first time I have been wrong.