Revoice Pro uses a license that must be installed on an iLok USB Key.
If you received a Revoice PRO Activation Code it should look like this:
(where X's are numbers)
Note that this code is NOT a licence but an Activation Code that you must redeem in the iLok License Manager (available from iLok.com ) to obtain your licence.
Watch the iLok.com video below to see how to use an Activation Code to get your license into an iLok USB key.