[QUOTE=Musicat]
OK, so I can accept that the ISP or University keeps tabs on IPs with date & time stamps, and the IP can be traced to a room or a computer, especially if static. But do they keep records of such detail as downloaded file names? That seems like an awful lot of data to have to store, but without it, who could tell if the traffic is legal or not?
And another thing. Without a subpoena, how can the RIAA find out which IPs are being used, let alone who, when and what file? If I call up my ISP and ask what Mary Jane User is doing online right now, I doubt if they will tell me. Does the RIAA subpoena ALL records from a University? And would a judge or court allow this broad a fishing expedition absent probable cause?
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I imagine that the RIAA gets a warrant to get a search made of all internet traffic going through a particular public node, along certain parameters - based on their understanding of how certain file sharing systems work, looking for transfers with names that match copyrighted content that is owned by their member companies.
Each packet over the internet includes its source IP address and destination IP address, so they know the IP address of who’s sending the file and who’s getting it. Looking up these addresses will narrow them down to ISPs or other organizations that reserver their own internet addresses, like big universities. Then, they can go and subpoena them, ‘we have probable cause that this address was getting a copyrighted file, who does the address correspond to?’
That’s the key detail that you’re missing I think - they don’t start their fishing expedition with the local ISPs or as to look at ‘records’ of every little piece of internet activity - as you say, that would be way too much data to be collecting and keeping as a regular thing.
However, they do get warrants for ‘fishing expeditions’ I suspect, based on the results of previous ones or on other evidence they can present that copyright violation is occuring. It’s a bit like the FBI setting up shop in the postal routing station in Topeka, kansas and searching the letters and parcels that passes through. Once they find one that’s contraband, they can figure out who it was being shipped to.
Of course, the silver lining is that this sort of thing being digital, things can be arranged so that of all the traffic being examined, anything that doesn’t match the contraband parameters never sees human eyes and the records are discarded by the searching program.
(pardon my WAG there)