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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
Cast protocol is only one of the many many things that you can stream through a chromecast device.
Care to elaborate?
It's a remote controlled web browser. It supports stuff like Netflix because the DRM support is maintained. When that stops it will get Blurayed and old players will fail to play new content