Duration of permitted use refers to the length of time that a trademark owner allows another party to use their mark without enforcement action. This concept is crucial in understanding how a trademark's protection may be affected by inaction or tolerance on the part of the owner, particularly regarding principles like laches, estoppel, and acquiescence. If a trademark owner does not act against unauthorized use within a reasonable time frame, they may be seen as permitting that use, which can lead to a weakening of their rights.
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