The Serial Copy Management System or SCMS is a copy protection scheme that was created in response to the digital audio tape (DAT) invention, in order to prevent DAT recorders from making second-generation or serial copies. SCMS sets a "copy" bit in all copies, which prevents anyone from making further copies of those first copies. It does not, however, limit the number of first-generation copies made from a master.
SCMS was also included in consumer MiniDisc and DCC players and recorders. With the demise of these formats, SCMS is not in widespread use. However, the concept of SCMS was resurrected in the broadcast flag, a measure (now defunct) mandated by the FCC to limit the copying of digital TV signals.
Read more about Serial Copy Management System: History, Technical Details, Circumvention
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