How would I set a checkbox to activate a link in a wordpress blog?

I want to be able to let people download stuff from the blog, like code for people to use. But I want to make sure people read the "License/Copyright" stuff before hand. It would say something like, "Check to agree to terms and开发者_JAVA百科 conditions" and when they click it the download link is activated.

Bonus: records their IP address from where they downloaded it, and the time when they downloaded it.

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If you are using jQuery, you could do something like this:

$('.checkbox').click(function() {
    if (this.checked) {
        window.location.href = "/url/to/download";
    }
    else {
        // error handling
    }
})

If you're not using jQuery let me know and I'll whip up a pure Javascript example.