If you need to use a site which requires registration, you can usually make up an identity if you don't want to give them your real personal information. Delete your surfing history. Be cautious when buying online. Make sure that the site into which you're entering personal information, such as your credit card number, is secure. If you find that you are listed, contact the site and ask to be removed.
Some sites obtain their information from credit bureaus and telephone directories.
Even if you ask to be deleted from their online databases, you may reappear the next time they update their database from the source. This information may be used for marketing purposes. If you do not want your name and address included in requests for 10 or more records, you may ask the department to withhold your name and address from those requesters by completing and returning 'Opt-Out' form MV3592 Request to Withhold Name and Address. There are many more extreme steps you can take if you are very concerned, such as buying special software to encrypt any information you send, or to make you completely anonymous online. U.S.A. Discreet Data Research Discreet Data Systems Public-Records.