Hello, I don’t understand the licensing terms in Highcharts.com. They use the terms “INTERNAL SITE” and “SINGLE SITE”. What is the difference between “INTERNAL SITE” and “SINGLE SITE”?

I use the stand-alone method, and bind the route+maps+charts via iframe into my website. The credits do not appear in the maps. OK, the OSM credits are displayed in a separate line below the maps. But not Google credits. The Highcharts.com credits with the Creative Commons license also not, and that is a license condition.

Or how is it?