@zombieman - well, that is until of course they macth the hash id of the file in question with the hash id of the a particular file on the P2P network and ask the simple question, where did u get the pirated file in the first place??? so that throws the aliby possibility right out the window.
Actually writing a share virus would do more harm than good....
1. It would discredit P2P even further, laws would be pushed thropugh the legal system easier, in the end, a lot of countries may see P2P file sharing criminalized altogether.
2. It would be extremely dangerous if it infected a lot of PC's as some more malicious versions of the virus could appear, using the same spreading techniques as the original, but with a lot more firepower in it.
3. Some innocent old men and women who have an internet service with a monthly upload limit could end up with a huge bill after their PC uploaded 300GB or so of their country music their sons/daughters ripped to the PC for them, so lets say the limit for month of upload was 20GB, and they uploaded 300GB at premium rate, lets say something like 3c a MB, works out at about $8400
there's just some examples of why this isnt a good idea :-)
Other idea's exist, like the possibility of P2P2P - which is uploader --> idle bandwidth of another filesharer --> downloader. This seems like a safer approach as if the downloader was lets say the
RIAA, they wouldn't get the source IP address and would have no case since i dont believe its illegal to setup some sort of proxy server to be accessed by general public (eg, other filesharers????). It would depend on fast connections so sorry 56k, you're out of that one :-)
Another is P2P groups, where it is merely you and your buddys on your own little P2P network sharing files/streaming music with each other. A network exists known as Grouper that does just that!