Re: Worse to come
I guess they'd play the copyright card, and come down hard on anyone selling plans based on the designs for interlocking bricks that they hold rights to. They didn't just patent the pattern which is used on the bricks that they sell, but also patented lots of other patterns which would achieve similar results so as to deter copyists.
[here I have used the word patent, because I think it's the right term, but intellectual property law is not my strong point. Hopefully I've conveyed the general point, and please feel to correct my terminology if I'm got it wrong]