According to Microsoft documentation, the internal windows database can be used to support Active Directory Rights Management Services (AD RMS). However, Microsoft recommends the use of the internal database for a test lab only. For a production environment, you need to utilized an external database. I have not been able to find exact figures on the number of users it can support. Considering a test environment usually has less users than a production environment, this should not be an issue.
Reference: http://technet.microsoft.com/en-us/library/dd772659(WS.10).aspx
Reference: http://technet.microsoft.com/en-us/library/dd772659(WS.10).aspx
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