I agree. An unlocker app also does not require any maintenance. You just 
need to check its presence on the device, that's it. No need for importing 
/ filtering lots of data, no need for writing server software.

On top of that when you really do want to go that route of validating 
legitimate users via order number how are you going to issue the following 
problems:

   - Someone gives away his/her order number to other people
   - Someone just guesses the order number. It's not particularly secure
   - In case of LVL usage: someone cracks your free app and makes it upload 
   a known user's email address who purchased the app (to my knowledge you can 
   only validate someone via Google account name / email address using this 
   route)

If you keep on using the LVL in an unlocker app you can avoid these issues 
(if implemented properly).

On Tuesday, December 4, 2012 6:38:00 AM UTC-6, b0b wrote:
>
> I would just transform the paid app into an unlocker app that is checked 
> by the main app.
>
> Anything else seem really complicated.
>

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