Technical Details
SCMS copy protection looks for bits written in the subcode data in a digital link. There are three states of these bits: copy allowed (00), copy once (10) and copy prohibited (11). If the source has the copy bits 00, and a copy is made of the source, the copy itself will have the bit set as 00 as well, allowing copies to be made from copies. If the source has the copy bits set as 10, every copy of this material will have the bits set to 11, and making a copy from the copy would be prohibited.
Read more about this topic: Serial Copy Management System
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