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Jury orders Google to pay $339M for patent-infringing Chromecast
(arstechnica.com)
This is a most excellent place for technology news and articles.
Looks like it's specifically the "casting" portion of Chromecast. The patent details having one device, in the example an iphone, request to play a video on a larger device, where it'll either play it from cache or pull it from the internet to display it. Seems a bit generic to actually patent something like that, but as usual parents serve to do nothing other than stifle innovation.