Cloud App Security protects:
Microsoft Office 365 services, including Exchange Online, SharePoint Online and OneDrive for Business
Other cloud applications, including Box, Dropbox and Google Drive
Cloud App Security requires service accounts to integrate with those services that it protects. The service accounts can be categorized as:
Delegate accounts to integrate with Office 365 services
Authorized accounts to integrate with other cloud applications
The service account that you create in Cloud App Security does not require a license.