Information You Need to Verify Your Identity
The personal information you enter must match the information you provided us on your most recent tax return. We use the following information to verify your identity:
• Name
• Social Security Number or Individual Tax ID Number (ITIN)
• Date of Birth
• Filing Status
• Mailing Address
• Third Party Verification Questions - you must provide answers to questions about personal information such as prior address, mortgage information, etc., that only you should know.
You must also provide us with a valid email address, which we will confirm and use to notify you if your registration information changes.
Your confirmation email should arrive quickly so check your junk folder if you don't see it.
Source: http://www.irs.gov/uac/Taxpayer-Iden...on-Information
This is the same as a serf living on the local lord's land: he cannot own anything, but he has the use of the land, and the crops he can get it to produce through his labor.