Due to laws surrounding Whois information for .us and .co.uk domains, we are unable to offer our ID Protect service for the two TLD's at this time.
The .us registry recently had this to say:
"The United States Department of Commerce's National Telecommunications and Information Administration ("NTIA") has recently completed its review of "proxy" or anonymous domain registration services by .us Accredited Registrars. At the conclusion of this review, NTIA directed NeuStar to phase out the offering of such services by Registrars or by any of its partners or resellers and to ensure that complete and accurate WHOIS data is provided for any existing registrations in .us."