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The Lenovo 20.0W 16:9 Privacy Filter by 3M utilizes the patented 3M microlouver privacy technology so only persons directly in front of the display can clearly see the image on screen. Passersby or those viewing from an angle see only a blank, dark screen. With identity theft concerns growing and information disclosure laws becoming increasingly more restrictive, the requirement to protect sensitive data is critical. Unique attachment system keeps the security filter in place even when the laptop is closed.