When we deployed DLP, it did identify some compliance issues (we are a pharma company). More importantly, it identified what sensitive documents (Word, Excel, PDF) were leaving the company and needed to be better controlled.

Based on that info, we are in process of evaluating ERM vendors. Adobe seems very good at controlling PDFs but Liquid Machines seems to cover the most file types and applications. In any event, we are using the DLP output to drive our enterprise rights mgt. strategy.