well you can thank apple for that. Apple complete refusal to let others use its DRM is starting to truly come back and haunt them.
Companies are afraid to try to make their own out of fear apple will just intentionally break it. Now MS is powerful enough to prevent that from happening. Just in things that some way directly compete with apple stuff, apple has a habit of not exactly playing nice.
No, anyone can write DRM and make it work on OS X, and Apple couldn't and wouldn't break it. Why would they even care? that's not the real issue.
No one else writes DRM for Macs because there is NO POINT. the platform is teency-weency. The government in the UK has had to force the BBC to produce mac-compatible stuff, because, why bother?
The thing that Apple is really holding back from developers is the ability to get support for other DRM on the iPod. That's what they really want, and, thank APPLE, that's not going to happen, because that's just what the world needs, right? More DRM. I don't want Apple to license DRM because it's forcing the industry to NOT use DRM at all to get on the coveted iPod. That Apple has contributed to the downfall of DRM by making their own is brilliant irony, and quite frankly, sidled with Apple's desire to get its own (like everyone), what I think is eagle-eyed consumer protection. I really think Jobs & Apple really played the record industry--they seem to think that Amazon Unbox is going to hurt Apple... right, hurt Apple by allowing customers to put no-strings-attached media on their iPods, the same iPods that are making Apple a royal killing.
As for movies, I think that's a bit different. DRM will take a lot longer to overthrow with movies, and until it does, I'll be buying DVDs. As the Mac platform grows, though, it will get some other form of DRM support, like Silverlight that's already coming. And that's a reasonably great thing, to me. I don't care about DRM on something I have no intention of owning, rentals--that's all well and good. I would ecstatically pay $10/month to stream MS-DRMed videos to my Mac for rentals. If MS gives me a good deal on a product available on a platform I like, I am there. I *love* my MS Bluetooth notebook mouse, right down to its little travel pouch. Netflix for Digital downloads would be totally awesome, with or without MS, and I would certainly very rarely ever use Apple's comparatively overpriced system of rental.