For the Artist Tube You need to use your Sensibility License ..
When you doesn't have one you can request
The Artist is the exclusive owner of there product
The tubes are for Digital and Online use only, when you want to print it in annyway of shape of form you need to have a contract with the designer
Its not allowed to share, sell or be used for profit
When you use a Artist Tube on your creations you must credit the artist like this
©Full Name of Artist/Artist website/license number