[ticoombs]

It also proxies images, which I think is the actual reason (sic). So there is no way from a network point of view to disallow pornographic material on public access terminals. Though, I have not recently looked at how the other search engines do it.

As a long time DDG user, the image filter isn't perfect and occasionally I'll see NSFW images even when I have safe search on.

[netsharc]

I noticed on my city's public network Google Safe Search, and the DDG equivalent, is enabled by force.

Apparently for Google it's done by aliasing www.google.* to forcesafesearch.google.com [1], or for DDG: safe.duckduckgo.com [2]

[1] https://www.draytek.co.uk/support/guides/kb-dns-safesearch [2] https://duckduckgo.com/duckduckgo-help-pages/features/safe-s...