You'll have an IP address from the cafe. The RIAA will know (it's easy to look up) that the address came from the cafe's ISP. They will have to get the ISP to cough up which of their customers had that address at that time, which will point back to the cafe. At that point the RIAA will shrug and find some lower-hanging fruit, or they'll send somebody to sit in the cafe and sniff the wireless network. (I'm betting a.)
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