Thanks Nikolay!!!
I read your blog also....
http://nelenkov.blogspot.in/2012/07/using-app-encryption-in-jelly-bean.html

On Thursday, September 19, 2013 9:52:24 PM UTC+5:30, Nikolay Elenkov wrote:
>
> On Thu, Sep 19, 2013 at 4:27 PM, gauri <[email protected] <javascript:>> 
> wrote: 
> > Hello, 
> > 
> > The android app downloaded/purchased from Google Play is stored in 
> > "/data/app" directory. 
> > Does Play Store or android system modify the apk after download? 
>
> Not for free apps. 
>
> > When I purchase it from Play store, after my app launch, digest 
> verification 
> > is getting failed. 
> > I found that the message digest which I have stored in app and the 
> digest 
> > which I am calculating at run time are differing. 
>
> On 4.1+, paid apps are forward locked by default, which is implemented 
> by splitting the APK in a public (in /data/app) and private part 
> (in /data/app-asec). You are most probably calculating the hash of the 
> public part only, hence the mismatch. If you have a rooted device 
> you can verify by searching for you package name in /data/app-asec. 
>

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