a litigation discovery document system is provided to help identify documents that might be privileged . in particular , a system is described in which documents within a document set are compared against one or more data sources which store data that indicate whether a particular document is privileged or potentially privileged . human reviewers can confirm whether such determinations are accurate . analytic reports can be provided which characterize the underlying methodology used to make such determinations . related apparatus , systems , techniques and articles are also described .