Your organization can purchase a set of Reviewer licenses, allowing non-authoring users to view repository objects, but not edit structured documents.
Reviewer licenses allow non-authoring users to log in to the Astoria Reviewer interface or the Workbench, and participate in workflow tasks where they are designated as audience members of a workflow job.
Reviewer licenses are not managed using a license group, such as the authoring license groups. Any user in the All Users group is allowed to use a Reviewer license. Reviewer licenses are considered "floating" licenses; that is, the number of licenses your organization purchases supports that number of concurrent reviewers. If the number of concurrent users equals the number of reviewer licenses, additional users will not be able to log on.
The Check License command reports information about Reviewer license usage. See Checking License Information.
Although reviewers are not required to be a member of a group to use a Reviewer license, you may wish to create one or more Reviewer groups to simplify the management of reviewer users. Use Access Controls to control what repository objects can be accessed by reviewers or reviewer groups.