<i>Thinking about it... Couldn't the protocols not advertise the parts of the file the sharer has, but, instead, receive a list of wanted parts from the downloader and respond with some, but perhaps not every, part of the file? What would happen to these lawsuits if nobody ever shared the whole file with anyone?</i><p>This relates to an idea I had: create a "fair use" file sharing network, by posting carefully-chosen 10 to 30 second "review" clips of songs on various web sites, then distribute a tool (script, program, whatever) that can locate the pieces and reassemble them.