Possible Duplicate:
Device IMEI locking for tablets
Is there any way to lock my android app by using IMEI no.
I want to do this because I do not want to allow users of my app to share it by sending APK to other device.
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The apk itself cannot be locked to the paid user, until JellyBean. From JellyBean onwards, paid apps are encrypted and stored on the phone.
Here is a solution that Screencast application seems to use. When you purchase it, they store your identity in their server. Each time you open the application, they verify your identity again before proceeding. The problem is, ofcourse, even registered users cannot use it if they are not connected to the net.