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 per user per year for Self Transcription. Auto Transcription minutes are shared with everyone in the group.
You get a central admin interface from which you can assign, revoke & reuse licenses at any point: