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The word "serial" in warez context means a unique number which identifies the license of the software as being valid. All retail software uses a serial number or key of some form, and the installation often requires the user to enter a valid serial number to proceed. A serial can also be referred to as a "CD Key". When you search for "p90x workout videos s serial" for example, you may find the word "serial" amongst the results. This usually means your warez download includes a serial number.
