This is to prevent children from accessing adult material on the web when parents are against it. Some people regard this as a form as censorship, but it is very different from the kind of government censorship which many people are against. Censorship is the banning of material to stop it being available to the public. We're on line now, with several dozen pentium's in the library. Most of our little darlings are using them to log on to porn sites, getting around the firewall with ease.
Continual supervision is neither practical nor desirable.
This is why some sort of web site rating and filtering system is essential while wider censorship which restricts free speech is not. Web filtering systems are analogous to the various measures used to prevent children from buying or viewing adult material in books, magazines and films. Weburbia's scheme is designed not to help authorities who wish to ban material from all public and private view. This is why the Safe For Kids ratings do not distinguish between different types of adult content and why authors of adult sites are advised not to rate their sites unless they are not concerned about strong censorship issues. It will then be possible to set up a safe environment for children on the web when and where it is desired.