How to make licence for j2me app ?

hello friends,
I want to make licence for my j2me application. Like 30 days evolution licence.
If user runs my application after 30 days, it should expire.
We have calander class, but if user changes the date of its mobile instrument frequently, will it work ??
Do I have any other trick ?

I would use an RMS datastore instead of writing to a text file. You can make the RMS datastore only visible from your MIDlet, instead of a text file (encrypted or not) that could be visible by all. You can still encrypt the contents of the datastore, but having it encrypted and inaccessible is just another level of protection for your license.

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