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In general, a serial number (序號 ) is a unique number assigned for identification which varies from its successor or predecessor by a fixed discrete integer value. Common usage has expanded the term to refer to any unique alphanumeric identifier for one of a large set of objects, however in data processing and allied fields in computer science. Not every numerical identifier is a serial number; identifying numbers which are not serial numbers are sometimes called nominal numbers. Sequence numbers are almost always non-negative, and typically start at zero or one.
For computer products, a Product key (also referred to as a CD key) (產品序號 ) 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.
For example:
產品序號
安裝序號
請參考網:


http://en.wikipedia.org/wiki/Serial_numbers

http://en.wikipedia.org/wiki/Cd_key


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