What are the techniques to implement evaluation period and ensure it is not tempered?

Posted by understack on Stack Overflow See other posts from Stack Overflow or by understack
Published on 2010-03-31T11:28:51Z Indexed on 2010/03/31 11:33 UTC
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I've a simple product installer for windows OS, which could be evaluated for a month. What are the techniques I can use so that this piece of software is not used after a month? I've seen that several s/w use system date to check it but it's very primitive and easily forge-able. I think a key based system based on registry or online verification could be an option but I don't know much about these.

Please help.

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