Unlimited: No licenses are checked for the account or its content. This option is appropriate for organizations using Content Controller to distribute content to internal LMSs, or for situations where you prefer to handle licensing outside of Content Controller.
Limit by Content: Separate licenses are checked for different content in the account. This option is appropriate if you use an à la carte model where each course is offered with its own limits on usage. This option is also useful if you have content bundles that you license together as a unit.
Limit by Account: A single license is checked against aggregate usage across the entire account. This option is appropriate if you typically sell access to your entire content library, or for any other model that involves a single license covering all content usage for a particular customer.
When you create a new account, you will select one of these three options as its license type. The account's license type will be shown on its details page, and you can change the type by clicking the "Edit" button in the upper right corner of the page.