You can`t extend USB unlimited useing repeaters, but useing USB-Hubs with an own powersupply should work.
Hmm... I don't think so. I think USB uses a fairly tight timing, and signal propagation times would probably cause you problems if you tried this.
Actually, reading, I see that the USB limit is 30 meters with 5 repeating hubs, and no segments longer than 5 meters. So it MIGHT be able to make it, but not have much to spare. Personally, I'm not sure I'd trust that connection.
If this makes you insane, ethernet (and wireless ethernet) cameras with some streaming ability are now pretty darn cheap, and you might want to give up and go with one of those.
This is probably the best advice, if you can do it. Go with a camera over ethernet, instead.
