Enterprise ID is created, owned, and managed by an organization. Adobe hosts the enterprise ID and performs authentication, but the organization maintains the enterprise ID. End users cannot sign up and create an enterprise ID, nor can they sign up for additional products and services from Adobe using an enterprise ID.
Administrators create an enterprise ID and issue it to a user. Administrators can revoke access to products and services by taking over the account, or by deleting the enterprise ID to permanently block access to associated data.
Enterprise IDs are recommended in the following scenarios:
If you need to maintain strict control over apps and services available to a user.
If you need emergency access to files and data associated with an ID.
If you need the ability to completely block or delete a user account.
You only get an Enterprise ID when you have a Cloud-Contract or you've ordered a volume-license. In the second case the Dealer you bought the license from will create an enterprise ID for you. This seems to be equivalent to microsoft and their volumelicensing mechanism.