Permission from Francesco Lorenzetti to use his work

I got in contact with Francesco Lorenzetti about using his work as a background image on secur.ity-pro.be and he gave me his explicit permission. His email response was the following:

Hi weekend,
since you are doing an open source project you have the right to use the image! enjoy
:)

This means I am permitted to use this image, and potentially other projects are also permitted to use it as long as they are opensource. Though it may require permission on a case by case basis. To be safe, contact him on his Artstation page if you also wish to use this image.