Ashley Madison Data Dump

So obviously some media outlets have the full dump (The story about Duggar having 2 accounts on there; the story about the 15k US government domain addresses; etc).

What's the legality of having that info, and publishing portions of it as these media sources are doing? What if a blogger did something similar?

I can tell you Ashley Madison is actively pursuing people who post it and demanding its removal as illegally obtained, confidential/proprietary and whatever else they can claim.

But I mean they are sending C&Ds and getting it taken down that way. I don't think they've sued anyone for damages or anything as it wouldn't likely be worth it.