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How to add Google Licensing Key to my ANdroid APP?
I don’t quite understand what you are asking, the Play store will not install to a device until the user has paid for the app. I can’t see your problem here.
what is there to stop someone buying the app through Google play, then copying the application and sharing it with someone else who hasn’t paid for it?
I believe to copy a paid app and access the .apk file you must have rooted (jailbreak) your device. I doubt your average user will bother. No matter what security you place on something there is always someone that will break it just because they can.