Here's some memorable points from the article. I've removed some of the more techy bits.
The same issue that affects graphics cards also goes for high-resolution LCD monitors. One of the big news items at CES 2007 was Samsung's 1920x1200 HD-capable 27" LCD monitor, the Syncmaster 275T, released at a time when everyone else was still shipping 24" or 25" monitors as their high-end product. The only problem with this amazing HD monitor is that Vista won't display HD content on it because it doesn't consider any of its many input connectors (DVI-D, 15-pin D-Sub, S- Video, and component video) secure enough. So you can do almost anything with this HD monitor except view HD content on it.
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Vista's content protection mechanism only allows protected content to be sent over interfaces that also have content-protection facilities built in. Currently the most common high-end audio output interface is S/PDIF (Sony/Philips Digital Interface Format). Since S/PDIF doesn't provide any content protection, Vista requires that it be disabled when playing protected content [Note E]. In other words if you've sunk a pile of money into a high-end audio setup fed from an S/PDIF digital output, you won't be able to use it with protected content.
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Vista requires that any interface that provides high-quality output degrade the signal quality that passes through it if premium content is present. This is done through a "constrictor" that downgrades the signal to a much lower-quality one, then up-scales it again back to the original spec, but with a significant loss in quality. So if you're using an expensive new LCD display fed from a high-quality DVI signal on your video card and there's protected content present, the picture you're going to see will be, as the spec puts it, "slightly fuzzy", a bit like a 10-year-old CRT monitor that you picked up for $2 at a yard sale
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Amusingly, the Vista content protection docs say that it'll be left to graphics chip manufacturers to differentiate their product based on (deliberately degraded) video quality. This seems a bit like breaking the legs of Olympic athletes and then rating them based on how fast they can hobble on crutches.
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The Microsoft specs say that only display devices with more than 520K pixels will have their images degraded (there's even a special status code for this, STATUS_GRAPHICS_OPM_RESOLUTION_TOO_HIGH), but conveniently omit to mention that this resolution, roughly 800x600, covers pretty much every output device that will ever be used with Vista. The abolute minimum requirement for Vista Basic are listed as 800x600 resolution (and an 800MHz Pentium III CPU with 512MB of RAM, which seems, well, ?wildly optimistic? is one term that springs to mind). However that won't get you the Vista Aero interface, which makes a move to Vista from XP more or less pointless. The minimum requirements for running Aero on a Vista Premium PC are ?a DX9 GPU, 128 MB of VRAM, Pixel Shader 2.0, and minimum resolution 1024x768x32?, and for Aero Glass it's even higher than that. In addition the minimum resolution supported by a standard LCD panel is 1024x768 for a 15" LCD, and to get 800x600 you'd have to go back to a 10-year-old 14" CRT monitor or something similar. So in practice the 520K pixel requirement means that everything will fall into the degraded-image category.
(A lot of this OPM stuff seems to come straight from the twilight zone. It's normal to have error codes indicating that there was a disk error or that a network packet got garbled, but I'm sure Windows Vista must be the first OS in history to have error codes for things like ?display quality too high?).
There's plenty more. I'll post more after you've read that.