HTML5 Encrypted Media Extensions aka DRM, has to be supported http://www.w3.org/TR/encrypted-media/ That much I've found out. That should be the reason that it's become available on Linux, since Silverlight isn't needed then. I haven't used Linux or Raspberry Pi before, so need to understand the AR...
At the moment I've got a Windows PC running as a Netflix machine, running Firefox with a DNS plugin to get US content. The machine is use for general browsing too.
Is it possible to make a similar setup with a Raspberry Pi?