there are tons of ways that they could tell if you had a pirated version but most of them illegal without your permission to let them, and unless your part of a million dollar pirate ring they aren't going to risk a courtcase for illegally using your computer to see your personal data etc...

so basically they can't legally see if you have a pirated version of any of their software

there are billions of ways to get your ip, for starters just typin an internet address logs your ip in a logfile on some server miles away, posting that message the admins can see your ip, sendin an email, basically any activity on the net people can get your ip from, the only way to mask it would be to use a proxy (find out what it is yourself )

it is possible to get your address from your ip by resolving it to your hostname which basically gives them your ISP, they call them up and find out who's account that address was at a certain time, again this would only be done if your into some serious stuff and not just any old script kiddie of the street could do that