Licences are non-exclusive. Other creators may licence and sell the same course, and we do not undertake to tell you who they are or how many there are. If exclusivity matters to your business, do not assume it — ask us before buying.
You may not resell, sublicense, redistribute or give away the course material itself as a file, a document or a download, and you may not license it onward to another creator. What you sell is access to the course inside your space, not the material as an asset.
You may not present yourself as the author of material you licensed. Describing it as your course, your programme or your curriculum is fine; claiming you personally wrote lessons you did not write is not.