Specify the credentials for configuring AD RMS. The account that you specify must be a domain user who is a member of the ...

Specify the credentials for configuring AD RMS.  The account that you specify must be a domain user who is a member of the local Administrators group on the server where you are installing, updating, or uninstalling AD RMS, and it must have sysadmin permissions on the server that hosts the configuration database for the cluster.