Who Owns Your Medical App?

I don't mean you, even if you are the
one physically in possession of the app. I am talking about the one
that owns the rights to the app or where the data it generates is
stored. These may be owned by different companies, both with
conflict-of-interest issues. Because I do not own any medical apps,
I can only tell you what a friend had happen to him. He purchased
the app from Amazon, and