Unfair Competition (15 U.S.C. §1125(a); also state laws)
A trademark cause of action for a lawsuit against another for use of a Mark that the other does not have the right to use
Unfair or Deceptive Trade Practices (15 U.S.C. §45(a); also state laws)
Because use of a Mark by someone who is not authorized to do so could confuse consumers into thinking the goods or services being offered/sold are from the lawful owner, that is unfair and/or deceptive
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