Everyone worldwide sees this information. This is because, the information is supposed to be submitted to the WHOIS database for every single new domain name registered. WHOIS is an organization that manages all data regarding domain registration. All registrant details are considered public information, in addition to the nameservers and other simple details regarding domain registrations (e.g. registration, renewal, and expiry dates.) Anyone can access this information from a variety of WHOIS search engines, like http://whois.domaintools.com/.
Privacy protection protects your privacy by hiding this information. The personal contact information – name, address, phone, email – are replaced with generic registrar-generated content.