I have currently got a SharePoint 2010 RTM environment, 1 App Server 1 SQL. However i need to move the farm out of where it is hosted, so i have decided to build a new farm from scratch on a new server move content dbs etc and then remove the old servers. The new server will be Windows 2012 R2 so will need a SharePoint 2010 SP2 install. I am wondering if i'd be able to use the same licence etc for this or would i need to get another one
as per my understanding, yes you can use the same licensing as long as you decommissioned or uninstall the SharePoint completely on the old servers.
SharePoint licensing is for the Version ( i.e. SP 2010, SP 2013 or SP 2016 etc), that mean if you bought the license for SharePoint 2010 it will cover untill last update of SharePoint 2010 (unless MSFT say soemthing).