Worse yet, it instructs developers to validate against plain text data easily editable with any text editor. So why are all of the app store developers in this position? Apples current documentation on how to validate receipts is fairly complex, but the sample code and Apple own instructions ask developers to validate against data that is entirely external to the binary itself. Sean Christmann of Craftymind blames Apple for the mess:

I have confirmation that it works for Angry Birds and plenty of reports to back up the suggestion that other apps are vulnerable to this technique. It's not clear whether this vulnerability affects all Mac App Store apps, or only some. This method bypasses the app protection mechanism called ' Receipt Checking' which is supposed to link Apps purchased to a specific Apple ID. Once you’ve found the app, all you have to do is install it as you would any other application and then copy over 3 files (and/or folders) from any legitimate download that you’ve made in the App Store - even if it’s a free download (Twitter, for instance). Sure, you can’t readily download premium apps without paying for them, from the App Store, but that’s never stopped files from ending up on pirate websites before.

So what does it take in order to pirate an app from the Mac App Store? All you have to do is find the.

Cracked mac software