If the software plainly states that it will be sharing a file with other people, then you cannot say 'I didn't know I was sharing it'. Likewise, you cannot say that it installed without your knowledge nor can you say it installed but you couldn't uninstall it.
Couldn't you still claim that someone else installed it on your computer, without your knowledge? For example, your 12 year-old son, who may know more about computers than you, but doesn't have the (legal) capacity to agree to a software license in the first place?
At first glance, Ferrell adds, the multiple connections to his PC looked on his security alert system like some kind of SQL attack.
Oh really.
The moon is made of green cheese. -- John Heywood