I'm just finishing an application in VC++. But before I send it to the person, which order it, I want to make some security, so that I'll get paid for my work. What I want is, that my application works OK for a few days (10, 20, 30, ...), but after that it won't run any more (when you'll run it, it will automatically close). So when the customer will pay, he will get the new version without any security.
What is the easiest way, to do such thing? Maybe some examples?