It certainly possible if your rivals has got into some kind of agreement 
with the OEM(s) to sign their app with the system key.

On Thursday, 25 October 2012 16:00:50 UTC+5:30, alex kyo wrote:
>
> Download and install apps from google play without prompt.
> I know there are only 2 ways to achieve that, sign the 3rd party app with 
> a system signature or root the device.
> But I think both will cause security trouble and neither will be 
> acceptable to the end user.
>
> My question is 
> Is it LEGAL to implement APK's silent installation for commercial use?
>
> I was told that our rival company made it recently.
> And they prepare to release their service next month.
>
> Does google have any legal regulation on that?
>
>
>

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