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For my VB.NET applications, I am wanting the user to have a free trial for x amount of days.
Where is the best place to record the amount of days past?
In the registry? Can’t someone just delete the registry key, and then have the full x amount of days again?
Is there a better way?
Anything you store on the user machine could be compromised.
If you are serious about this thing then your “best” option is to have a webservice that your apps call at every startup passing some form of identification string.
(And this could be compromised too).
For the purpose to generate an identification string you could look at this question and the following answers