Overlay Secret is a privacy filter for Nintendo DS. It lets people see what you’re playing on your Nintendo DS screen. It’s not the first time we’ve seen a similar filter from Japan. We hope to get our hands on it before the next Pokemon game hits the U.S. Nintendo DS hits the US soon, hopefully before Pokemon is released in December 2015. We’ll be able to preview the new version of the Nintendo DS from next year’s release date on June 28.”]
Source: https://gizmodo.com/overlay-secret-privacy-film-for-nintendo-ds-166838