Let's be real, all discs by all manufacturers can arguably be called copies of some other disc already in existence. If not copies, than attempts to copy and improve. The discs may not be exact in dimensions and shape but a lot are pretty damn close. At this point in the game, there isn't a whole lot of innovation left in disc design...just improvements and tweaks on existing ideas. With a lot of discs, if you removed the brand tooling on the molds, most folks wouldn't be able to tell two different models apart (or even name them) just by feel or look or perhaps even flight.
So I can't picture any company getting too up in arms about an upstart coming along and producing a disc that appears to be a direct copy of one of theirs. If a new company puts out a "speed 12", wide wing, overstable driver, it's going to be compared to the Destroyer, or called a copy of it, no matter what they do or what their intent is. As long as the new company isn't calling itself Inneva and calling that driver Distroyer, there's nothing that can be done to stop them, nor do I think anyone would try.
As for when the sport goes "nuclear" and some large outside company decides to swoop into the market, I think they're far more likely to buy out an existing company (or two) and put their brand on existing discs than to start from absolute scratch. In other words, Nike isn't going to jump in and try to create copies of Aviars and Destroyers and Rocs. They're likely going to buy up a Legacy or Prodigy and slap swooshes on the Rival or H3 instead of trying to clone a Teebird.