If I am reading your question correctly I think the answer it's answered in
the reimaging document on this link.
in particular this section:
This posting is provided "AS IS" with no warranties, and confers no rights
|> Date: Thu, 16 Aug 2007 12:55:54 -0700
|> From: OM <firstname.lastname@example.org>
|> User-Agent: Thunderbird 126.96.36.199 (Windows/20070509)
|> MIME-Version: 1.0
|> Subject: activation on volume lic. media
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|> Message-ID: <#Oun19D4HHA.4436@TK2MSFTNGP03.phx.gbl>
|> Newsgroups: microsoft.public.windows.vista.installation_setup
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|> X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
|> I am very confused about the activation on volume lic. media of Vista.
|> Hope someone can help me out.
|> I read many documents about Vista activation and they all said Vista
|> installation requires activation for volume license media. But when I
|> talked to the Microsoft customer service department (both technical and
|> licensing), some of them said activation is not required for Volume lic.
|> media. I was confused.
|> The reason I want to find out this information is that I would like to
|> know what would happen if I restore a Vista image (created from a volume
|> license media)on a PC which has its copy of oem Vista activated.
|> Microsoft allows reimaging of operating system using volume licensing
|> media. This works for XP volume licensing media because it doesn't
|> require activation. But if Vista volume license media require
|> activation, does that mean I need to purchase a volume license for this
|> "new installation".