Summary of the situation:
a°: good for his security center means good for his own security
b° good for H..Pi means one less client for them, it's all profit especially for the present intervener
a° detailed subject:
before the P2P network it was
A Central Unit Server the coveted file is located there the people on the other end know very well that there is a not very pretty version of the product in a server floating around in the world, in the Web.
The conjugation connects in the present
I connect
you connect
he connects
we connect
you connect
they connect
we saturate the line
Before a server was quickly saturated because all the downloading enthusiasts connected but most importantly downloaded the file at the same time first come, first served or those who had a fast line had a serious advantage over others sometimes the server no longer responded because demand exceeded supply.
So to counter this, P2P shows its claws:
Instead of a server Central Unit why not connect all PCs together with the Central Unit as Central Station serving trains on several tracks to several small stations.
So your PC is connected certainly to the Central Server but also to several other machines.
No more saturation, less constraint the Central server is lightened since it distributes files to all other stations and most importantly the others will do the same job.
P2P equal to equal in Upload & Download
I download but I must also to participate in the system I must also distribute.
Risk of catching a virus?
P2P Hard drive to hard drive:
Well, for example, I see your username on the network you are somewhat stingy in terms of file sharing you take but do not share so other interveners block your line or a clever one or I know that you like a certain music, an artist or whatever? so what he does is create a virus then rename it as a file, music that you like, you on the other side of the web what you will do, you will download it without questioning.
P2P VS Windows Security
For the P2P network to work on your PC, you force yes I say you the administrator you are in the crosshairs you give the order to Windows to sacrifice the Firewall to open it to facilitate transmission exchanges.
Your only goal is to get the file as quickly as possible I'm confident it's a local site; no sir global site the broader the scope the greater the risk. Step out a bit, there are not only the virus of the National Gendarmerie that circulates you have international variants or the international hacker adapts to the IP address facing him.
Playing Russian roulette
I can't see a fan of checking the integrity of a hard drive of a person on the other side of the world before downloading one of their files at each connection. He on the other side can do "hacking" on your own station.
An open Firewall, you know the risks.
After the unfortunate Windows Security Center, in cooperation with the antivirus will be pointed out Administrator owner of the session who has all privileges completely responsible for the damage caused in his registry.
He will come here or elsewhere asking for help to eradicate his registry and especially that's the best part of the story he will say this what's the best free antivirus right now? because mine is too bad.
Regarding HADOPI I won't dwell on it either you also know the risks
it doesn't just happen to others
got it, see you!
