against the explicit wishes of the owner. There're several cases have been tried on this issue. Some have permitted linking, some not. but it is a concern.

I read their conditions and terms. None of them explicitly said map image linking is not allowed. The purpose of my web page is not to provide map services, and I'm ready to take it down anytime if the map providers in this group protest. But I'm going to leave the documentations (i'm still writing) intact for educational purpose only.