The CyberDust app (similar to Snapchat) detects when it is being screencast (even via a Quicktime recording according to this article).
What API makes this possible?
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1See http://stackoverflow.com/questions/13484516/ios-detection-of-screenshot – tounaobun Aug 05 '15 at 02:11
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2@BensonTommy that question is about taking screenshots. This one is about screencasting. – Warpling Aug 05 '15 at 04:28