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From: bender@oobleck.Eng.Sun.COM (Michael Bender)
Newsgroups: sci.electronics
Subject: Re: SCMS copy protection
Keywords: SCMS,DAT,CD,copy protection
Message-ID: <4802@exodus.Eng.Sun.COM>
Date: 19 Dec 90 01:37:09 GMT
References: <1990Dec13.132416.13905@cc.ic.ac.uk>
Sender: news@exodus.Eng.Sun.COM
Organization: Sun Microsystems, Mt. View, Ca.
Lines: 22

In article <1990Dec13.132416.13905@cc.ic.ac.uk> umapu02@cc.ic.ac.uk (D.A.G. Gillies   Supvsr  Dr K.J. Bignell) writes:
->
-> 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

Hi, last month Bob Clements posted results of his tests with the SCMS, you
might try him at: clements@bbn.com.

mike
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