You're basically combining three parts, Steam Streaming, nVidia's hardware stuff, and OpenVPN. OpenVPN and all the high-level ideas it embodies definitely predates Gankai or anything like that. Steam Streaming and nVidia's stuff are certainly going to be covered by their own patents. In theory the combination could be patented but I'd argue for "a network stream can be run over a VPN" is firmly "obvious to those skilled in the art"... network streams are network streams are network streams.
Sony et al probably have more specific patents for their own setups, but to the extent they cover this setup they'd either be obvious, or they'd be trying to sue you for doing stuff covered under nVidia or Valve's patents. This, alas, doesn't necessarily protect you, but would certainly raise some PR issues. Plus Amazon might have some questions as well, since they don't want people getting hit for using cloud services to do things; anything that smells like special cloud licensing just because you're doing X "but in the cloud!" is going to hurt their business model.
I can't guarantee they have nothing to sue over, but the costs/benefits would not seem to argue in favor of Sony suing.
Sony et al probably have more specific patents for their own setups, but to the extent they cover this setup they'd either be obvious, or they'd be trying to sue you for doing stuff covered under nVidia or Valve's patents. This, alas, doesn't necessarily protect you, but would certainly raise some PR issues. Plus Amazon might have some questions as well, since they don't want people getting hit for using cloud services to do things; anything that smells like special cloud licensing just because you're doing X "but in the cloud!" is going to hurt their business model.
I can't guarantee they have nothing to sue over, but the costs/benefits would not seem to argue in favor of Sony suing.