Product key A Product key (also referred to as a CD key) is a specific software-based key for a certain program or a computer game。
It is used to identify that the copy of the program/game is original。 Activation is sometimes done offline simply by entering the key, or with software like Windows XP online activation is required to prevent multiple people using the same key。
Computer games use product keys to verify that the game has not been illegally copied; for example, one could not play Diablo II or Starcraft online without an original/unique product key。
Another example is Battlefield 2 or Battlefield 2142 will not allow you to play online when two identical product keys are online at the same time。
Product keys consist of a series of numbers and/or letters。 This sequence is typically entered by the user during the installation of computer software, and is then passed to a verification function in the program。
This function manipulates the key sequence according to a mathematical algorithm and attempts to match the results to a set of valid solutions 。
CDKEY是指软件注册需要的序列码。大部分商业软件都需要使用序列码（或CDKEY码）安装，这些序列码一般都标注在产品包装或说明书上。安装序列码（SN，serial number）和CDKEY码在软件安装后形成特定的产品注册码，用户还可以使用这组注册码向软件生产商注册以获得今后的各种技术支持服务 CD-碟,KEY-钥匙.就是碟的钥匙，专业术语叫注册码，实际就是一个密码，但是这个密码和普通密码不同的是它只能通过读碟来输入而不能从键盘输入，即使别人知道了也不行，一般网上银行需要用它以保证客户资料的安全。 简单说cd key 是软件注册码
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