If the stores do this, they probably say so in their TOS, it seems legally
dubious to modify your app without your consent.

Kris



On Sat, Oct 5, 2013 at 3:09 PM, Richard Schilling <coderroa...@gmail.com>wrote:

> It's possible that some stores will modify your app to add some Digital
> Rights Management checks to help prevent hacking.  You might have to look
> into the Android Source code to see what happens.  There is a DRM package
> in the API:
>
> http://developer.android.com/reference/android/drm/package-summary.html
>
>
> Hope that helps.
>
> Cheers,
>
> Richard
>
>
> On Thursday, September 19, 2013 12:27:36 AM UTC-7, gauri 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?
>> I have calculated message digest of apk before it's upload to Play store.
>> I am calculating message digest of the downloaded apk (present at
>> /data/app) and verifying it with the digest stored in my app.
>> 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.
>> Am I going in right direction?
>>
>> Thanks.
>>
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