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If you use a name or image to identify your business and the products or services it sells, you have a right to prevent others from using that mark to identify their products, in a manner that might confuse consumers.
To have trademark protection, your mark must be affixed to your product or its packaging, or clearly used to identify the service you provide. Furthermore, you must actually "use it in commerce," meaning that it must be used in association with something you are selling on a regular basis.
To get the strongest protection, you should register your trademark with the U.S. Patent and Trademark Office.