This is called eDiscovery, and people have been working on it for a good while, certainly longer than two years (I worked at a startup in this space, 2009-2010).
Pretty shocking when you think the first book on digital evidence didn't come out until 2004. You want a legal field ripe for disruption? It's definitely the eDiscovery space.
Here's the book I was referring to:
http://legalsolutions.thomsonreuters.com/law-products/Treati...