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So few people grasp that there is a difference between copyright, patent and trademark protection. Much less what that difference is.
And you most certainly can trademark a distinctive shape, or any number of other things that uniquely identify your products and services, as I'm sure Coke has done with the shape of their bottles. There are a number of registered trademarks on colors, and competing products cannot use those colors. Harley Davidson has a registered trademark on the distinctive sound of their motorcycles (which they've spent millions to make consistent on modern engines - it came from the earlier models that used washing machine motors and had no real carburetor). Dave Hestor of Storage Wars fame has a registered trademark on his distinctive "YUUUUPP!" that he uses to bid.
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