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).
It's interesting to note the first book on eDiscovery came out in 2004. Didn't sell many copies as you can imagine, and was pretty ahead of its time.
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.
