[treehau5]

> wrap it in a commercial product and resell it.

The PATENTS.txt file seems to suggest otherwise, you must stay within the bounds of "covered code". IANAL so I do not know what the side effects of this seemingly intersection of their patent/license coverage curtails, but it does seem like you lose protection and could have a Android/Oracle situation if you innovate something on top of the core CLR outside of the 'covered' bounds and then decided to sell it.

There's a slightly older writeup about it here http://endsoftpatents.org/2014/11/ms-net/

In any case, as the name suggests, it's only a promise, not a guarantee of rights.