The best thing to do is contact your reseller or see if the contact details here will put you in contact with the appropriate people.
It may depend on exactly what type of site licence you have.
These forums are mainly for support rather than licensing queries.
Hi Dunky2k, as far as I know you can install as much ePO servers as you want with the same serial number but what will count will be each VSE installed node.
This means that you can install 2, 3, 4... epo servers but you can only deploy VSE up to 250 nodes