Dilution by Tarnishment Law and Legal Definition
“Dilution by tarnishment is association arising from the similarity between a mark or trade name and a famous mark that harms the reputation of the famous mark.
The following shall not be actionable as dilution by blurring or dilution by tarnishment:
(A) Any fair use, including a nominative or descriptive fair use, or facilitation of such fair use, of a famous mark by another person other than as a designation of source for the person's own goods or services, including use in connection with--
(i) advertising or promotion that permits consumers to compare goods or services; or
(ii) identifying and parodying, criticizing, or commenting upon the famous mark owner or the goods or services of the famous mark owner.
(B) All forms of news reporting and news commentary.
(C) Any noncommercial use of a mark.” (15 USCS § 1125)