Want to Hide Path to Pay Per View Audio File

So now that I have this "working" and can see PPV hide the content and then show it once I'm returned to that purchase page from PayPal, I am surprised that once the content is shown, I can see the full path to the MP3 file I am selling as PPV. How is this going to be a pay-per-view if the person can merely open the link to the content, bookmark that link and come back? Is there something else I need to enable? Is this due to sandbox testing?

The way this is working now, it's merely a purchase this audio link forever scenario.