Talking to Gizmodo a Netflix spokesman said that these older devices are running Windows Media DRM, a digital rights management service that has since been replaced by Microsoft PlayReady. Netflix has been using PlayReady since 2010, as it's easier to get content from movie studios and other vendors in this format. As of December 2, these older devices that can not upgrade to PlayReady will be locked.
Affected are Roku SD (N1
Owners of these particular models also had problems with other services. Last year, Hulu announced that it would stop supporting VIZIO Smart TVs with VIZIO Internet Apps and older Roku models. Older Roku devices can still access videos from the Hulu streaming library, but not on features like premium add-ons or live TV.