An alternative to get "unrestricted" WHOIS data access is to be prepared to pay a lot of money to individual registrars. As ICANN rules dictate:
3.3.6.2 Registrar may charge an annual fee, not to exceed US$10,000, for such bulk access to the data.
3.3.6.1 Registrar shall make a complete electronic copy of the data available at least one (1) time per week for download by third parties who have entered into a bulk access agreement with Registrar.
So to query GoDaddy and the like without restriction, you may well need a hefty sum of cash.
Note that the ICANN rules place (the usual kind of) restrictions of the use of this data so a careful reading is recommended.