Enterprise DRM as a way of protecting data loss???

Please - unauthorized use is not even close to being an internal threat.

By definition - data loss, is unauthorized network transfer of data that the user is ALREADY permitted to access.

There are really 3 sources of data loss, DRM is worthless security countermeasure for preventing data loss.

The first (and mildest) is trusted insiders;
I have access rights to a sensitive file. I open it in Word, save to PDF, send it to my private Gmail account.

The second (and next severe) is malicious outsiders. It's easy to socially manipulate a customer service person over time with minor compensation for non-critical data, gaining their trust. But - eventually - the time comes when the attacker will ask for more - for core company data - and get it.

The third (and most severe) is IT operations. Riddled with buggy applications, poor integration and configuration - DRM will never mitigate this threat to data loss.

Danny Lieberman