Security expert Bruce Schneier has written an interesting essay about Vista.

Windows Vista includes an array of “features” that you don’t want. These features will make your computer less reliable and less secure. They’ll make your computer less stable and run slower. They will cause technical support problems. They may even require you to upgrade some of your peripheral hardware and existing software. And these features won’t do anything useful. In fact, they’re working against you. They’re digital rights management (DRM) features built into Vista at the behest of the entertainment industry.
And you don’t get to refuse them.
The details are pretty geeky, but basically Microsoft has reworked a lot of the core operating system to add copy protection technology for new media formats like HD DVD and Blu-ray disks. Certain high-quality output paths — audio and video — are reserved for protected peripheral devices. Sometimes output quality is artificially degraded; sometimes output is prevented entirely. And Vista continuously spends CPU time monitoring itself, trying to figure out if you’re doing something that it thinks you shouldn’t. If it does, it limits functionality and in extreme cases restarts just the video subsystem. We still don’t know the exact details of all this, and how far-reaching it is, but it doesn’t look good.
Microsoft put all those functionality-crippling features into Vista because it wants to own the entertainment industry. This isn’t how Microsoft spins it, of course. It maintains that it has no choice, that it’s Hollywood that is demanding DRM in Windows in order to allow “premium content” — meaning, new movies that are still earning revenue — onto your computer. If Microsoft didn’t play along, it’d be relegated to second-class status as Hollywood pulled its support for the platform.
It’s all complete nonsense. Microsoft could have easily told the entertainment industry that it was not going to deliberately cripple its operating system, take it or leave it. With 95% of the operating system market, where else would Hollywood go? Sure, Big Media has been pushing DRM, but recently some — Sony after their 2005 debacle and now EMI Group — are having second thoughts.
What the entertainment companies are finally realizing is that DRM doesn’t work, and just annoys their customers. Like every other DRM system ever invented, Microsoft’s won’t keep the professional pirates from making copies of whatever they want. The DRM security in Vista was broken the day it was released. Sure, Microsoft will patch it, but the patched system will get broken as well. It’s an arms race, and the defenders can’t possibly win.
I believe that Microsoft knows this and also knows that it doesn’t matter. This isn’t about stopping pirates and the small percentage of people who download free movies from the Internet. This isn’t even about Microsoft satisfying its Hollywood customers at the expense of those of us paying for the privilege of using Vista. This is about the overwhelming majority of honest users and who owns the distribution channels to them. And while it may have started as a partnership, in the end Microsoft is going to end up locking the movie companies into selling content in its proprietary formats.