It appears that this bill is extremely poorly written in how it defines peer-to-peer software:
From the bill:
(3) PEER-TO-PEER FILE SHARING SOFTWARE- The term ‘peer-to-peer file sharing software’--
(A) means a program, application, or software that is commercially marketed or distributed to the public and that enables--
(i) a file or files on the computer on which such program is installed to be designated as available for searching and copying to one or more other computers;
(ii) the searching of files on the computer on which such program is installed and the copying of any such file to another computer-- (I) at the initiative of such other computer and without requiring any action by an owner or authorized user of the computer on which such program is installed; and (II) without requiring an owner or authorized user of the computer on which such program is installed to have selected or designated another computer as the recipient of any such file; and
(iii) an owner or authorized user of the computer on which such program is installed to search files on one or more other computers using the same or a compatible program, application, or software, and copy such files to such owner or user’s computer; and
(B) does not include a program, application, or software designed primarily--
(i) to operate as a server that is accessible over the Internet using the Internet Domain Name system;
(ii) to transmit or receive email messages, instant messaging, real-time audio or video communications, or real-time voice communications; or
First off, wouldn't "the Internet Domain Name system" include reverse DNS? Secondly, "Peer-to-peer" software is nothing more than machines acting as both "clients" and "servers" and the broadness of what they believe "peer-to-peer" programs are could include public web servers.