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防伪码 = Security Code 或 CAPTCHA
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为辨别购买的真（实），请到网站输入配送您的防伪码。
Enter the security code provided for purchase verification.
puting to ensure that the response is not generated by a computer. The process involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. A common type of CAPTCHA requires that the user type the letters or digits of a distorted image that appears on the screen.