ClickBank Link Security Script

I need someone to implement the following ClickBank Link Security Script to protect videos played on a flash player and access to .mp3 files. [login to view URL] When the customer completes a purchase, several values are passed along to your thank you page in the query string if you have specified a [secret key][1] in your account settings. These are the ClickBank receipt number (cbreceipt), the epoch time of the order (time), the ClickBank item number (item), and the ClickBank proof of purchase (cbpop) value. During the purchase we encrypt the receipt, time, and item using the secret key you specify in your account. We will then pass the result back to you as a query string parameter called cbpop. Use the validation script to confirm the cbpop value is correct. **PHP SOURCE: function cbValid() { $key='YOUR SECRET KEY'; $rcpt=$_REQUEST['cbreceipt']; $time=$_REQUEST['time']; $item=$_REQUEST['item']; $cbpop=$_REQUEST['cbpop']; $xxpop=sha1("$key|$rcpt|$time|$item"); $xxpop=strtoupper(substr($xxpop,0,8)); if ($cbpop==$xxpop) return 1; else return 0; }** ** Must use PHP and mySQL (if necessary) ** ## Deliverables If you have an example of this already created, please let me know the link. I will check it out. Thanks.