The Review package is the default package that is assigned to you the first time you log in. The Review package uses a review license, which allows you to look at modules, and add discussions to modules and objects. If you want to edit, copy, or move objects, or create and delete links, you need the Edit package. When you select an Edit package, a request for an edit license is sent to the license server. If the request is successful, the edit options become available in the web client. If there are no edit licenses available, or if you are not allowed an edit license, a message is displayed and you keep the Review package.
Once you have acquired an edit license it is not released until you log out, even if you downgrade your package to Review.