"[Name of your project] was created using assets and imagery from Elite: Dangerous, with the permission of Frontier Developments plc, for non-commercial purposes. It is not endorsed by nor reflects the views or opinions of Frontier Developments and no employee of Frontier Developments was involved in the making of it."
The long form version should be used for video content, community sites/fan pages or for longer editorials, where it can be adequately fitted in without affecting the creativity of the piece. This could be in the credits, header/footer, or terms & conditions, depending on the nature of the content. As long as it is not deliberately obscured or hidden from viewers.
