well signing your application is only for the purpose of security
while uploading it on android market!
once you have genrate ur "private keystore" , u have to signed ur
application with that "private keystore" to publish it on android
once publish that apk and later if u redesigned or made change in
your app source code and want replace the app in the market u have to
use the same "private keystore" without that same keystore u cannt
change or modify the application thats the only purpose of it! as far
as i know
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