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You would need to either:
a) check your server logs... I'm pretty sure it should show up as a referrer site; or
b) build the page you are including to record the referrer site into a database or the like.
Alternatively, you could set the script so that if the referrer is not your site, just fail.
Either way, you can't be sure that this will track everything. At the end of the day, you're hoping for the browser to tell you where it's coming from and this cannot be relied upon..
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