said by Mr_Stealth:
you have a point
if I spoof my neighbor's IP and MAC address and use his Kazaa username it would appear to the RIAA that I was him
...
Yeah but if you spoof the IP & MAC you wont be able to establish a connection and actually down/upload any files to the RIAA henchman.
I guess it depends on how the RIAA is building lists of people of whom to send C&D letters to.
I would think the "proper" way is to actually establish a connection with the "target" user and "grab" a copywronged file from him, verify contents, and off the letter goes.
--BUT, it is the RIAA and based on their track record I'll assume they just get a file listing and off the letter goes, regardless of actual contents.