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Many Internet sites are set up to prevent unauthorized people from seeing the information that is sent to or from those sites. These are called "secure" sites. Because Windows Media Player supports the security protocols used by secure sites, you can send information to a secure site with safety and confidence. (A protocol is a set of rules and standards that enable computers to exchange information.)
When you visit a secure Web site, it automatically sends you its
certificate, and the Player displays a Lock icon 
on the status bar. (A
certificate is a statement verifying the identity of a person or
the security of a Web site.)
If you are about to send information (such as your credit card number) to an insecure site, the Player can warn you that the site is not secure. If the site claims to be secure but its security credentials are suspect, the Player can warn you that the site might have been tampered with or might be misrepresenting itself.
When you click on the Lock icon , the certificate of the Web site is
displayed.