I'm not sure if the author is at all knowledgeable about the technology differences between Bittorrent and Kazaa.
Basically, its like comparing apple and oranges. Let me get my cluebat out and get warmed up. First Kazaa is not a protocol, it is merely a piece of software that uses the Fast Track protocol. Fast Track protocol is vulnerable to spoofing of files, due to the fact that the checksum and encryption schemas are quite poor. I'm sure that anyone who has used Kazaa can attest that you it is not uncommon that the content of files could be very different than what is expected. Additionally, the payload of the software is complete with crappy adware/spyware.
In contrast, BitTorrent is a robust filesharing protocol, which was designed to share pieces of large files in a distributed network. It is vastly superior to P2P tool in many respects:
- Encryption algorithm
- Checksum scheme
- Distribution method
I recommend that anyone who wishes to learn more about BitTorrent, check out the protocol developer, Bram Cohen's talk.
