Thanks for the link Peter. I read (skimmed) the patent, and it didn't see a definition of which motors would be used to drive the stabilizer. Judging by the age of the patent, 1999, I would safely assume them to be servo motors, as opposed to brushless ones that Abad is using. Would the patent still be applicable? (I'm assuming yes?) And if so, where does the line be drawn?
I predict that a lot of 3rd party companies are going to try to make their own version of what Abad did.