Below are a range of useful links to other website which have helpful information on EDIUS.
Check your EDIUS licence
With EDIUS 8 and 9 you can make an EDIUS ID which stores your serial number (this is mandatory with EDIUS Pro). On this page is a link to the page to access your EDIUS ID info: https://wwwapps.grassvalley.com/edius8register/
There is a limit to how many times you can activate and deactivate EDIUS. If you want to check what the current status is on your licence you can visit this page and enter your serial number: http://activation1.grassvalley.com/flexnet/operationsportal/logon.do