It's a brand name, like any other. Usage of it requires fulfilling the brand requirements. It's like how you can't say a burger from Burger King if it's actually from McDonalds, even if it's a very similar hamburger.

But even then, this isn't uncommon for food and beverages. You can't call it "whisky" unless you follow certain requirements about the mash bill, barrel, etc.

(My dad, before his death, had started growing "Pennsylvania Simply Sweet" onions. Because you can't call them Vidalia.)