The TN below details how to install BE 2014 and included the licensing.
Maintenance is simply requested as a renewal each year, with licenses not expiring. So no need to add in new licenses every year. If you let your maintenance lapse then you don't get access to free upgrades and support from Veritas, so it is in your best interests to renew it annually.
As for upgrading, the TN below shows you how to upgrade to BE 15 for instance: