The defense of genericness refers to a legal argument used to challenge the validity of a trademark by asserting that the term or phrase has become a common name for a type of product or service rather than being associated with a specific source. When a trademark becomes generic, it loses its distinctiveness and legal protection, which can occur through misuse by the owner or through widespread public use. This concept is crucial in understanding how trademarks can become less effective over time if not properly maintained.
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