Let’s say that one day the Gray Aliens show up and decide to stick around for a while and, while they do not freely give us technology as the overly optimistic might desire, we do become acquainted with some of it.
Let us assume that some of it, small bits here and there, is very similar to technology we already have.
Of course, someone, somewhere is going to want to sue the Grays for patent infringement. “Hey, you have touch screen interfaces! We own that idea!” or “We own the concept of recording digital media in ways similar to that!”
What traction would this gain and/or what limitations would be placed on this sort of thing, as the legal system currently stands?