Java: Protect Trial/Demo Period [closed]

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I searched, and only found a couple([1][2]) of answers here. None of them really answer my question though.

My application will have a thirty day trial period. What's the best way to protect the program? I'm not worried about crackers, just Joe Average reinstalling the program. Setting back the clock isn't really a concern eith开发者_如何学Cer.

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Here's exactly the question you're looking for:

Implementing a 30 day time trial