Recent WooCommerce winners

I was looking that the winners of Most Wanted Winners: WooCommerce Shopfront Themes, and I’ve noticed that some of the themes, if not all, are using real world products.
How can I go about using that kind of images, do I need some kind of permission, and where could I get one? :smile:

Also, some of the most popular themes on the marked are using famous brands, and they don’t even hide their logos/labels.