Question about Marble software

[Piotr Starzeba]

Hello,
I have a question. I have a Marble 0.8.0.
If I will make my own map (art work) base on your software, may I sell it
as my "art work". For example. I would like to write a book and put few
historical map which I will create base on your software. My I sell my book
with maps, which I created using your software?
Does your licence allow me to sell my product based on your software? How
does it work?
Sincerely,
Peter