This product is licensed in two ways: by "named server" and “per enabled user.” When licensed by “named server,” separate licenses must be purchased for each source and target device. Once used in a job, the license is tied to the device.
When licensed by “per enabled user,” every “enabled” Active Directory user, whether used for “service accounts” or not, must be counted in the total number of licenses purchased. This license model is equivalent to an “Enterprise” license type. This means you can use the product on as many devices necessary to complete a data migration.