Abstract
We ha ve been engaged in the study of countermeasures to prevent the leak of onscreen content (texts, images and movies) using a digital video camera. One of the studies is the development of a transparent sheet that emits infrared (IR) light, which is applied to the screen and generates optical noise in the onscreen photographic images when recorded. Another study is the development of a method to detect video recording/camera shooting near the display as a countermeasure to prevent video recording using the IR-cut filter. This report is prepared as an advance report because it was confirmed that the feasibility of such countermeasures is enhanced. 1. Introd uction
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