I have a video on my web site that can be purchased through paypal. Vistors have to purchase the video before they can view it. Once they complete the purchase then they are redirected to my web page to watch the video. I need some help with blocking the address bar, so they cannot copy and paste into a new web browser and returning to the video page without paying. My consern is one person will purchase the video and then share the web address on the video page. How do I block the copy and paste on the address bar.