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The word "keygen" means a small program that can generate a cd key, activation number, license code, serial number, or registration number for a piece of software. Keygen is a shortcut word for Key Generator. A keygen is made available through crack groups free to download. When writing a keygen, the author will identify the algorithm used in creating a valid cd key. Once the algorithm is identified they can then incorporate this into the keygen. If you search a warez download site for "call of duty 4 key keygen", this often means your download includes a keygen.
