Mac app store hacked, how developers can better protect themselves Crude instructions have started showing up online with ways to circumvent Apples Mac App store receipt validation. By simply copying receipt and info.plist data from a free app and pasting it into a paid app, you can run apps copied from friends computers or bittorrent. I myself have a copy of a paid app (not angry birds, but one with stronger protection) running on my system that was purchased by a friend. This is a massive failure in the implementation of Apples receipt system.