Doesn't Mathews and BowTech use designs that are copied from Martin and other bow manufacturers, but claim they design whatever and are the only manufacturer that has their design?
The only design that I can think of off hand is Mathews harmonic dampeners. Martin came out with VEB (vibration escape modules) in 95. But then again a deal could have been swung to use the solo cam technology.
Or...by using the same principle but changing the design allows for a legal loophole.