We are integrating with market to provide inapp billing on our app.
The implementation guide says for additional security, we can use a
server to do the key verification process. This is so we dont bake the
apk with the public key I suppose.

Having a server side presence for us for right now is overkill. So,
outside of the proguard obfuscation (which we are doing), are there
any recommended security techniques that we can incorporate to make
the apk tighter ?

>From my understanding, the market does not facilitate downloading any
bits upon a purchase, or else we could have used this to only
conditionally install the "pro" class files.

Any hints/advice/lessons learnt would be helpful.

Thanks

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