It is really very confusing and financially not entirely harmless due to the different legislations. You may have a lawsuit on your hands faster than you think.
Therefore I decided to draw the floor pictures for my sceneries myself. It's a lot of work, but it's easy on your nerves and your wallet.
Here it is.
My email to Bing
Bing's response
So I'm a little surprised by that answer. 
When I called BING, I was told that downloading aerial photos using SBuilderX or similar software is illegal. For the licensing of two aerial photos of small ferry ports in Germany and Denmark I should pay 900 Euro per picture.
Therefore I would be a bit cautious and would have a written license sent to me.
