The Lanham Act provides for the registration of trademarks, which it defines in §45 to include "any word, name, symbol, or device, or any combination thereof [used or intended to be used] to identify and distinguish [a producer's] goods ... from those manufactured or sold by others and to indicate the source of the goods. The courts also protect "trade dress", but only if it has, according to the Walmart case, __________________ 

 been registered for fifteen years.

is commercially viable according to Forbes. 

a showing of a secondary meaning encompassing the design of a product. 

a specific product manufactured only by Walmart.

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