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A third type of protection is a trademark or a service mark. Broadly speaking, a trademark or a service mark helps consumers distinguish among competing products.

A trademark is a word, phrase, symbol or design, or any combination of these, that distinguishes one party's goods from others'. A service mark is essentially the same as a trademark, except that it identifies a service rather than a product. The word "mark" in this module will refer to both trademarks and service marks.

Ralph Lauren or ExxonMobil are examples of marks that use names. The Nike swoosh or McDonald's golden arches use designs. The distinct shape of a Coca-Cola bottle is a device that distinguishes a Coke from a Pepsi and other drinks. Even sounds or animation can be used as a mark. AOL's You've Got Mail!" phrase, the MGM lion's roar, and the logo at the bottom of the screen during CNN programming are other examples.

Two other marks you can register are "certification" and "collective membership" marks. A certification mark is a name, symbol or design certifying characteristics of the product such as its region of origin, method of manufacture, quality or accuracy. Smithfield (Virginia) ham, Cognac (France) and Scotch (Scotland) whiskey are some examples. A collective membership mark is used by members of a group, such as the American Society of Mechanical Engineers.

You do not have to register a mark, because legitimate use automatically establishes your rights. Doing so offers several advantages, though, including public notice and legal presumption of your ownership, and an exclusive right to use the mark nationwide with your product.

If you register, it is also easier to file a federal suit if someone uses your mark. It also makes it easier to register in foreign countries, and allows you to file your mark with the U.S. Customs Service to prevent importation of infringing foreign goods.