1. Other filesharing software
1.BT(Bit Torrent)
2.Clubbox
3.Foxy

2. About BT and author Author：Bram Cochen，2002
Homepage：

3. Some BT software BT Plus BitComet BitLord BitBuddy BitTornado Azureus
uTorrent
BitTorrent

4. BT principle Improve traditional P2P(have to queue)
Upload part others want
Download part we need
Many points file sharing system

5. BT implement 1. Torrent file and Tracker 2. Rarest First Policy
3. Choking Policy
4. Optimistic Unchoking

6. Torrent file and Tracker
Tracker：member list and location
Torrent file： 1.Tracker location
2.part file of complete name
For a new member：
1.Get Torrent file to know tracker
2.By tracker to interact with other member

7. Seed What’s seed？ provide source to let other download
Who can become seed？
1.Who first provides this file is a seed.
2.If this file was downloaded completely， the member also becomes a seed.

8. ClubBox Korea software 100GB space For free
Have to become member first
Some restriction

9. ClubBox character Three level member  different power
100GB space，can upload our file，but for 2 and 3 level member，it has some restriction
Constant download speed about 50kb/s
If we collect enough money points，we can download in 3000 kb/s for once
Box Points to determine whether can level up

10. ClubBox summary Provide a way like ftp to let us share file
Although its tedious rule，it’s also a good way to share file
To know files where can download，we have to go to the forum to get the path

11. Foxy A new and hot p2p software recently
Simple interface and easy to use
Without any restriction
Advantage=Disadvantage
Send many requests
Bandwidth and CPU consumption
Easy to betray private files

12. Comparison Speed：BT>foxy>eMule (ClubBox ?)
Security：ClubBox>eMule>BT>>>>Foxy
Source：foxy=eMule>ClubBox=BT
Convenience：eMule=foxy>BT=ClubBox
From above software，we know eMule is a practical software in these respects.

13. Summary
P2P software’s essence
P2P software = Crime ??