A group license allows you to purchase multiple licenses using a single credit/debit card or Paypal account. This is really useful if you are part of a team, organization, enterprise or university and need to manage user licenses and purchasing from a single account.
A group license costs 20 USD per user per year. Automatic transcription credit purchased by the group administrator is available for all users in the group to use.
You get a central admin interface from which you can assign, revoke & reuse licenses at any point: