The Depo Viewer role  is a role exclusively available to accounts that have Live Depositions.
This role limits your users to see only live depositions they are added as a viewer.

Depo viewers can see the real-time transcript

Typically, depo viewers are the lawyers and other relevant persons who need access to the real-time transcript and rough draft; that is, they have access to the session’s Viewer’s page where they can: 

• see the real-time production of the transcript
• leave comments and remarks on the transcript
• download the human-edited transcript once ready