[android-developers] In-app billing as a method of activating a trial feature?

I was thinking that I would allow my free app user's to have access to
some portions of my app on a limited time trial basis.

The biggest problem with this is that if the user uninstalls/
reinstalls, there doesn't seem to be a way of preventing them from
restarting the trial period. I know I could put some file on the SD
card and check for that, but that's trivial to defeat.

The only way I could think of this is running a server side check, but
that a) requires a server, b) requires the INTERNET permission.

The in-app billing seems perfect for this. I could set up the trial
as an item to "purchase" and Google will maintain for me the owners
list.

Does anybody have any opinion on this? What I need is to be able to
set the price of item to $0.00 and have access to the purchase date.
Is this doable?

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