[CS-FSLUG] A Cost Analysis of Windows Vista Content Protection

Timothy Butler tbutler at ofb.biz
Thu Dec 28 17:47:44 CST 2006

Hey, Jason,
	I haven't read the article, but I'll take a stab at it. Vista has  
DRM support for HD content, especially, but also other types of  
content. Depending on the particular restrictions of the DRM, the  
video may not play (or may play at a reduced quality) unless you are  
using a a/v connection that keeps the content encrypted on its way to  
the display.

	S/PDIF and Component have decoded information. So if you pop in a  
Blu-Ray disc and view it using component video, you could then  
capture the information and copy it with only minimal quality loss.  
Conversely, it would be much more impossible (without modifying your  
electronics) to capture the video if it were sent over an HDMI cable.  
HDMI has encryption that delivers the content to the audio and video  
units without exposing it to potential copying.


On Dec 28, 2006, at 5:42 PM, Jason P. Franklin wrote:

> Hey all,
> Total ignorant here... I've been reading the document and it's a  
> bit above
> my head.  I'm hoping someone can help me out a bit.
> Quoted from Disabling of Functionality:
> "Since S/PDIF doesn't provide any content protection, Vista  
> requires that it
> be disabled when playing protected content [Note D].  In other  
> words if
> you've sunk a pile of money into a high-end audio setup fed from an  
> digital output, you won't be able to use it with protected content.
> Similarly, component (YPbPr) video will be disabled by Vista's content
> protection, so the same applies to a high- end video setup fed from
> component video."
> What does this mean in plain English?  I know what S/PDIF is (at  
> least a
> layman's understanding).  Could someone give specific  
> examples...the one
> used is a bit too general for me to understand fully.
> Thanks.
> Jason P. Franklin
> Husband/Father/Missionary
> Westwood Bible Fellowship
> pastor.jason at westwoodbf.com <mailto:pastor.jason at westwoodbf.com>
> web: www.westwoodbf.com <http://www.westwoodbf.com>
> blog: www.westwoodbf.com/tboc <http://www.westwoodbf.com/tboc>
> -----Original Message-----
> From: christiansource-bounces at ofb.biz
> [mailto:christiansource-bounces at ofb.biz]On Behalf Of Frank Bax
> Sent: Thursday, December 28, 2006 11:11 AM
> To: christiansource at ofb.biz
> Subject: [CS-FSLUG] A Cost Analysis of Windows Vista Content  
> Protection
> http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.txt
> This document looks purely at the cost of the technical portions of  
> Vista's
> content protection [Note A].  The political issues (under the  
> heading of
> DRM) have been examined in exhaustive detail elsewhere and won't be
> commented on further, unless it's relevant to the cost analysis.   
> However,
> one important point that must be kept in mind when reading this  
> document is
> that in order to work, Vista's content protection must be able to  
> violate
> the laws of physics, something that's unlikely to happen no matter  
> how much
> the content industry wishes it were possible [Note B].
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