On Thursday, November 24, 2011 2:57:47 PM UTC, Nikolay Elenkov wrote:
>
> On Thu, Nov 24, 2011 at 11:37 PM, Ricardo Amaral
> <[email protected]> wrote:
> > I don't think those issues are really that relevant. For my situation at
> > least.
> >
>
> It's your app, so you should know best... But,
>
> > This is only to give out some free copies to some persons, not to use as 
> a
> > full validation system for every paying user...
>
> If you are worried about shared preferences being insecure, you should
> probably be worried about one of those persons posting his coupon to a
> forum, etc. If you allow coupon sharing, everyone would be able to get
> the full version using that coupon. If you think the risk is small enough,
> it's OK to ignore this, but you should at least consider the possibility.
> It's a lot easier than rooting your phone and changing preferences
> manually.
>

That's why, and for other reasons of course, the cupon system I linked 
above allows you to disable a coupon. If someone does something like that, 
they simply broke my trust and I shall invalidate their coupon. Than, no 
one else can use the app with that coupon. Of course I'll need to wait for 
them to pen my app while connected to the Internet so I can invalidate the 
coupon (cause like I said, I don't want to force an Internet connection to 
run my app every time).

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