obfuscation - What is the proper way to obfuscate the lisence key of an android app -

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i upload app use in app purchases , says carefull lisence key how can obfuscate properly? idea have in pieces , join later in oncreate not enough? shall put pieces of key in strings.xml?

the more distribute key in time , space harder replace it. not join @ single place (oncreate) - distribute pieces through code. make hard find pieces of key in code - never store them xored value. more security obscurity - , how store key should secret. use obfuscation.

remember protecting license key replacement. think how easy (fast) 1 can change key having sources of application.

also, modify source code dealing key, unique app. example google in-app billing comes in sources , relatively easy find 1 in decompiled sources hack.


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