I believe you CAN purchase a licensed multi-user copy for your server, it just costs a few dollars more. Call AWS and explain your situation, possibly they can help you out and let you upgrade to the multi-user pdf.
EDIT:...Call to make sure this option is available, I mentioned it only because someone told me they had purchased, or was trying to purchase a multi-use copy...so I don't know this to be 100% true. Maybe Ross or someone else can chime in and verify this information.