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    <p>Now there is the new Google App Licensing available. For deeper information read about it in the <a href="http://android-developers.blogspot.com/2010/07/licensing-service-for-android.html" rel="noreferrer">android developer blog</a>.</p> <p>A short summary: Google provides a library that makes a inter process call to the market client on the phone. The market client will then ask the google servers if the signed in user has purchased the app and forward this answer to you. There should be a public key in you developer profile that you need to encrypt the connection to the google server to prevent spoofing of answers. You also provide a application and device unique id with the query to make it impossible to forward approved queries to another device and build something like an licensing proxy with one bought copy forwarding the IS LICENSED answers to other devices. </p> <p>At the moment this service looks secure enough to protect even the more valuable apps in the market. I will give it a try and maybe come back and leave some more informations after I used it a little bit.</p> <p>If your app is really popular like an EA game or something this wan't stop users from hacking it. To hack the app somebody has to buy it, then unzip the apk, and edit the bytecode of your app to think that the market send a correct answer. The new byte code can be packed into another apk and can be installed on every phone that allows side loading. To make this harder you can always try to obfuscate your apk and make your bytecode hard to understand. </p>
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    1. POHow to prevent application thievery (specific to Android applications)?
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    1. COI would definitely change this to the correct answer since it's a new, Google-supported solution to this exact concern.
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      1. USMatt Huggins
    2. COBut this requires a working internet connection right? Is there a way to secure an app in the same way if you'd like that your app can be used without internet? (playing a game in a plane for example)
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    3. COIf you implement this the standard way the app only needs internet access once a week or so. The answer from the play store will be cached. If the user has not opened your app for some time and tries to use it without network it can fail. If you like your users you could save the times the market got a negative answer and disable the app only after x fails. This is nicer to the user but easier to hack to get access to the pirated app.
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