PeerGuardian is a powerful yet petite 
firewall application especially designed for 
P2P users and anyone else who wants to protect his or her 
computer from unauthorized searches instigated by private agencies and corporations.
 
PeerGuardian works by blocking and logging all 
TCP/IP connections to and from known 
IP ranges used by known P2P foes, such as the RIAA, MPAA, MediaForce, MediaDefender, BaySTP, Ranger, OverPeer, NetPD, and more.
 
To make sure that the block-list used to block malicious connections is up to date; PeerGuardian uses an on-line block-list 
Database that is continuously updated on a daily basis -- so your privacy will remain safe while swapping files.
 
PeerGuardian is compatible with all TCP/IP based 
file sharing applications, such as Kazaa, iMesh, LimeWire, 
eMule, Grokster, DC++, Shareaza, and more. In short, PeerGuardian is the must have tool for any file swapper.
 
PeerGuardian is not 
advertising supported, nor does it require registration, and no information is collected from or about product users.