I thought that this could be achieved via Application Licensing. I read it on 
stackoverflow, but I don't know how.

Am 20.02.2013 um 17:08 schrieb Nikolay Elenkov <nikolay.elen...@gmail.com>:

> On Thu, Feb 21, 2013 at 12:31 AM, Sandro Stricker
> <stsandr...@googlemail.com> wrote:
>> For this behavior I wouldn't need in-app billing. I just present the user a 
>> dialog to enter the code and if it's correct I make the app a premium 
>> version. Therefore the user would need to remember the promo code if he 
>> wants to install the app on another device or deinstall/reinstall it.
>> 
> 
> A free app with extra features you can enable usually equals IAB. You
> obviously can't
> do this with a paid app. And of course you want to make sure that if they leak
> a code on Twitter or something it doesn't allow the whole Internet to get
> your premium version for free.
> 
>> I need something that remembers that this user unlocked the premium version 
>> and will do so for future installs. And I don't want to implement my own web 
>> service that stores user accounts that unlocked the premium version.
>> 
> 
> Good luck with that :)
> 
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