To create an unlimited group, you will need to purchase an activation. An activation 1) allows you to activate a course onto a new or existing unlimited group, 2) allows all group members the ability to discuss questions and exercises within the course, and 3) gives you access to an author’s downloadable content when available. Once you are finished studying a course you can deactivate that course, which gives you back your activation, and start a new one. Deactivating a course does not delete the course or the group member’s data from your unlimited group. It only restricts group members ability to continue discussing the questions and exercises within the course. It also removes the group leader’s access to the author’s downloadable content. You can always go back and reactivate a course with one of your available activations.