[android-developers] App unlock codes from online database

Hi,

I have eleven apps on the market. Out of these I need to implement an unlock feature in nine of them. As I live in India, lite and pro versions are not possible. (I can't sell apps).

To get around this problem I decided on the following. The app is available for free download from the Android Market. Some of the features are locked. The user can purchase an unlock code from my website for an app. The code has to be entered into the app, which will then query an online database via a PHP "middleman". Each code can be used only once. 

My questions:

Is this approach feasible?

Is Lodsys likely to interfere?

Are there any code examples or some open source projects where I could find the code for querying an online MySQL database and for having lock/unlock features?

Thanks

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Raghav Sood
CEO/Founder/Owner/Dictator/Tyrant at Appaholics (Basically all titles required to have complete control)
http://www.raghavsood.com/
https://market.android.com/developer?pub=Appaholics

http://www.appaholics.in/

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