Although Google so far has prohibited software developers from including any type of advertising in their Google Glass projects, Google itself has patented the ability to use to track how consumers see and respond to ads, likely using the Glass system. The patent describes a process in which advertisers are charged when a viewer sees an ad in a "pay-per-gaze" scheme. Google in a statement cautioned that "[p]rospective product announcements should not necessarily be inferred from our patents."

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