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When a user has paid for a premium subscription app what happens to the activation code if that device is then factory wiped? It cannot be stored in SharedPreferences – what about Google Play? I’ve noticed some apps are able to recover the activation codes after factory wipes. How is this possible?
Most likely because they are stored in the cloud, at their servers, and when you reconnect with a recognized account they know it. That recognized account may as well be the Google-account. Windows 8 metro comes for instance with their own cloud-based storage for applications linked to peoples live-accounts
Also some apps may store an activation-file on the SD-card or to file. Factory swipe does not always mean a formatting.