I am not sure I understand what kind of "abuse" you are referring to. You would control access to the course through your LMS, (in this case, Moodle). Is it your students who will abuse the content? In what way?
If you mean they could make copies of images by copying and pasting from the browser, that is true of all web content. It is actually not easy in many of the templates because it has been embedded into a streaming flash file or some other format which won't show up in the browser cache. But there is no way to stop a determined person from copying pictures or text, except by restricting or controlling access. That is what the LMS is for. You could always run the course on a VPN.