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The way that they protect these CD's is by breaking the redbook (I believe it's the redbook) standard for Compact Discs. They cannot advertise the copyprotected CD's with the Compact Disc logo. My understanding of the whole scheme is that it puts incorrect values for the checksums for various parts of the CD (the checksum is a calculated value that is based on a segment of data; it verifies that the data is uncorrupted). This causes some CD drives (namely those on computers among some others) to not be able to read these disks. I don't think these discs will take off and even if they do, expect for CD drives that can work around this to come out soon.
Matt
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