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You can also use the built in variable $_SERVER['HTTP_REFERER']. In most cases, that will tell you the domain of the site the user is coming from. If they come from your free site, display the appropriate form.
Since neither of the methods JamesAB and I are talking about are 100% reliable, a little redundancy never hurts anyone so it might be good to run with them both and check for either of those conditions
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