™ tm for an unregistered trademark, that is, a mark used to promote or brand goods;℠ sm for an unregistered service mark, that is, a mark used to promote or brand services;® r for a registered trademark. The owner of a registered trademark may commence legal proceedings for trademark infringement to prevent unauthorized use of that trademark. However, registration is not required. The owner of a common law trademark may also file suit, but an unregistered mark may be protectable only within the geographical area within which it has been used or in geographical areas into which it may be reasonably expected to expand.
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