DRM as Freedom-Eating Infection

I've often written about DRM, and how it is antithetical to free software. But here's an interview with Amazon's CTO, which provides disturbing evidence that it actively *reduces* the amount of free software in use:

InformationWeek: Amazon is known as an open source shop. Is that still true?

Vogels: Where in the past we could say this was a pure Linux shop, now in terms of the large pieces of the e-commerce platform, we're a pure Amazon EC2 shop. There's an easier choice of different operating systems. Linux is still very popular, but, for example, Windows Server is often a requirement, especially if you need to transcode video and things that have to be delivered through Windows DRM [digital rights management], so there is a variety of operating systems available for internal developers.

Another reason to fight the spread of DRM. (Via @storming.)