How to make an Activation Issue?

[David Anderson]

Hi, How can I make something like this...
The final user installs the app
The app Runs and the User has to authenticate the app, which will be by
acessing a remote file on a Server, If he user dont authenticate the program
will run only for 3 days, after that it will be blocked until the user
authenticates it...
How can I do this?
Cya =)
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