Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!columbia!cs!fox
From: fox@cs.cs.columbia.edu (David Fox)
Newsgroups: gnu.misc.discuss
Subject: DAT copy protection (was "Free Nelson Mandela")
Message-ID: <FOX.89Sep5161157@cs.cs.columbia.edu>
Date: 5 Sep 89 20:11:57 GMT
Sender: news@cs.columbia.edu
Distribution: gnu
Organization: Columbia University Computer Science
Lines: 19

I'm pretty sure this is how the DAT copy protection *really* works:

	CDs are marked "I'm copyrighted" in their non-audible info.

	When a DAT records something marked "I'm copyrighted" it
	produces a copy marked "I'm a copy of something copy-
	righted."

	DATs will refuse to copy something marked "I'm a copy of
	something copyrighted."

Note that a DAT recording of the analog output of a CD or DAT will
not carry the copyright marking.  Also, pro equipment will not
pay attention to these markings.  Sorry for discussing this stuff
in an inappropriate newsgroup.  (Not sorry enough, eh?  At least it
has the word "discuss" in its name.)

David Fox
fox@cs.columbia.edu