Initial interest confusion is a legal doctrine under trademark law that permits a finding of infringement when there is temporary confusion that is dispelled before the purchase is made. Generally, trademark infringement is based on the likelihood of confusion for a consumer in the marketplace. This likelihood is typically determined using a multi-factor test that includes factors like the strength of the mark and evidence of any actual confusion. However, trademark infringement that relies on Initial interest confusion does not require a likelihood of confusion at the time of sale; the mark must only capture the consumer's initial attention.
A noteworthy hypothetical example of Initial interest confusion, first discussed in Brookfield v West Coast Entertainment,[1] involves two video stores. West Coast Video's competitor, Blockbuster Video, puts a billboard on a stretch of highway advertising a West Coast Video at an upcoming exit. In reality, there is no West Coast Video at this exit; it is a Blockbuster Video instead. The consumer, expecting to find a West Coast Video store, sees the Blockbuster Video and decides to patronize the suitable replacement. Even though the confusion has been dispelled, Blockbuster is still misappropriating the acquired goodwill of West Coast Video's trademark.