Hi Sam,
Yes you do own it. Completely.
I have to add that, with all due respect to Ray, I see 'creating' a little differently. From my perspective, the act of creating comes in many different shapes and forms. Ray is a very competent musician and, for him, writing and improvising music is not a problem. For a large number of forum members, though, that's not the case. Many people who use BIAB have very little understanding of music. One of BIAB's big strengths is that it allows less able musicians create music. To my way of thinking, that has to be a good thing

All the best,
Noel
EDIT: After reading Matt's post below, I realize that I should have been more thorough. I was only focused on using BIAB's melody creator. Thanks Matt.