This is from from ADC 2 announcement : http://code.google.com/android/adc/

"When you enter an application in the ADC 2, we will make it available
to all contest judges for free, exclusively for the purposes of
judging. If you intend to sell your application after the conclusion
of the contest, you may submit a "trial" version of the application
for judging. We recommend that your trial version include full
functionality, but with a timed expiration, rather than including
limited functionality with no expiration. Judges will evaluate your
application based only on the functionality accessible to them, so it
makes sense to provide the fullest range of capabilities possible in
your contest app."

>From what I've read so far in this group about timed expiry trial
software is:
1. Its a violation of the T&C of marketplace. If you have made your
app available for free you cannot charge for it at a later stage.
2. There is no way to persist data between uninstallation and re-
installation. So, even if trial software were allowed the users can
just uninstall and reinstall without the app having any chance of
verifying that the trial period is over.

How does one create a "trial" version on an application?

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