This presentation given at RSA 2007 by N. Lawson present the evolution of the copy protection over the years. The presentation focus on the central point of protectiont : asymmetry. Asymmetry is property that occurs when “forward operation is cheaper than reverse”.
As illustration it explain that if creating a copy is more expensive than buying the soft then asymmetry occurs. Of course this never happen for digital media, but if you think about paper book it is quite acheived : Ripping a book take endless hours and cost a lot. In this context most people prefers to buy their own original.
The slide about asymmetry for copy protection is a good summary of existing techniques and the analysis of Xbox 360 security is very neat. Overall this is a pleasant reading that present clearly the key points of today copy protection.
N. Lawson is the co-designer of the Blue-ray disc content protection layer and own root.org
Get the slides from root.org here or the local copy local copy
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