Prime numbers can also be copyrighted too, so you can have "illegal numbers", because all data on a CD, hard drive, etc...really boils down to is a very long collection of ones and zeros. Anyway whomever (whoever?) writes the Aerotech Facebook page seems to be in a rather ironic mode, and is trying to make fun of CTIs C & D order. But let's think of a similar scenario, Apple makes iDevices right? But if Dixie made a paper plate made called the iPlate (probably) would not sue, no conflict of interest there. However if Microsoft made a smartphone called the iPlate they most definitely would. This is essentially what is happening between Aerotech and Cesaroni. There was not a conflict of interest with the Pro-Maxx rocket since it was a kit, and CTI does not sell kits, though they can technically sue, it is not impinging (actually probably helping in a small way) on their sales. However, Aerotech has made a High Power rocket engine with the Pro-... trademark, which they can sue based on, and have legal precedent on their side. Again, also remember this could be (I am not saying it is) a deliberate move on Aerotech's part to force CTI into a legal battle, though this is unlikely as it really is a Lose-Lose situation and they would be gambling quite a lot of money. I dislike the fact that lawyers have to be involved, however this is the society that we have literally bought and paid for, and as such we really should not be surprised by Aerotech's or CTI's tactics.