[kmm1001]

Hello,
I wrote a Blackberry application and I would like to make the option to offer it on a trial basis for a week or 2 with the option to change the trial version into a purchased licensed.

Any recommendations on tool or the best approach to make this available?

Many thanks,
KMM

[simon.hain]

if you put a persistant object with the install date on the BB (without custom classes) it will stay on uninstall and can deny the application to run.

[kmm1001]

thanks Devinto, the objective is to be able to activate a trial version using an activation code if the user decided that he liked the product.

[zechariahs]

I have never done this, but I can think of two options.

You can write the code to validate the trial activation code and include it in the application. Then the application with verify the key and store the activation date in a persistent object (as mentioned above). If someone then enters a permanent activation code, the application validates it and removes the persistent object.

My second idea requires a web service that the BB Application can use to validate the key. This method requires more work, but it seems more secure as the key validation logic isn't deployed with the application. This method also gives you ability to de-activate a permanent activation code if it starts being abused.