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From: umapu02@cc.ic.ac.uk (D.A.G. Gillies   Supvsr  Dr K.J. Bignell)
Newsgroups: sci.electronics
Subject: SCMS copy protection
Keywords: SCMS,DAT,CD,copy protection
Message-ID: <1990Dec13.132416.13905@cc.ic.ac.uk>
Date: 13 Dec 90 13:24:16 GMT
Sender: umapu02@cc.ic.ac.uk
Followup-To: sci.electronics
Organization: Imperial College Computer Centre
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 Greetings folks. I have been reading recently in Hi-Fi World (UK Mag.) about Sony's
latest DAT recorder. It retails at 550 pounds sterling (ie about US$1100 ) which is
fairly cheap. However there is a discussion of the SCMS ( I think) copy protection
chipset and protocol that the record 'industries' insisted on introducing so that
their multi-billion pound/dollar/yen aren't reduced by 0.000001 % . Anyway, does 
anyone know the precise details of this system, and what it does. I know a) it isn't
the ghastly 'A-flat remover' that some android invented and nearly had adopted
commercially and b) it allows one generation of copies to be made, but no more. This
leads me to believe it must be altering the checksum in some way, but *before* the
digital data (16-wide,bitstream, whatever) hits the DAC. Or is it a more subtle
encryption ? Please email me at umapu02@cc.ic.ac.uk


 


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