Hah, 30 years old: https://en.wikipedia.org/wiki/Platform_for_Internet_Content_Selection https://en.wikipedia.org/wiki/Platform_for_Internet_Content_... It use

Hah, 30 years old: https://en.wikipedia.org/wiki/Platform_for_Internet_Content_Selection https://en.wikipedia.org/wiki/Platform_for_Internet_Content_... It uses meta HTML tags and correct configuration of the browser to block/allow different ratings. I suppose one could use wget, curl, or lynx to bypass that stuff and download the HTML files, and then find the links to the the JPEGs in them...