This would be totally true if the connections were being shared...
ie. Device 2, 3, and 4 connect to the cellular network via a wi-fi connection to Device 1, taking advantage of Device 1's unlimited data package.
However, in this case they're only sharing files amongst each other while only Device 1 has the ability to use the cellular network.
There are quite a few devices with the ability to share files amongst each other in an ad hoc network. EVTI didn't patent that part...what they patented was a method for controlling permissions and some other stuff, offering some form of security for all the devices [independently from one another?] on the network which, from what I'm seeing, is not currently available on any devices today.
I'll try to read more into it and see if I can't get some of my network-geek friends to break it down more for me to better understand.
