What is the most secure way to "Grandfather In" existing users of a paid iOS app that will go free?

Posted by coneybeare on Programmers See other posts from Programmers or by coneybeare
Published on 2011-01-13T04:33:53Z Indexed on 2011/01/13 4:57 UTC
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iphone

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apple

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ios

The title pretty much says it all, but I can elaborate. I have a paid iOS app that has plenty of existing customers. I think i want to convert to a free app now, and allow full upgrade via in-app-purchase. The problem is, I don't want to make my existing customers buy the app again to use it, nor do I want to make it easy for hackers to just flip a switch and get the pro version.

What is the most secure way to "Grandfather In" existing users of a paid iOS app that will go free?

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