I'll try to answer your questions to the best of my ability and others may add to my replies or correct them.
1. Courses are freely downloadable by anyone who has an account on this MAJ site. You should be able to stipulate how you allow your course to be used when you upload, but I don't think we can make a course non-downloadable. The idea, of course, is that they are "open" courses. As for particular content, I would suggest that if you have concerns about copyrighted material, then remove those items of concern from your course before uploading. You could then just add an explanatory label with guidance for the downloader to (re)create her own material there.
2. Again, you can ask that you be duly credited by users of your course and make that a condition of use. I think this is a trust issue. AFAIK, we don't really have any way of confirming whether the downloader has duly credited you or not. I believe that we now (or soon will) have a tool for determining how many times a course has been downloaded, although I don't know if we will be able to tell which has user has downloaded your course. That might be a good idea for future improvements to the site. I think it would be nice if we could implement a way by which course contributors are automatically notified when someone downloads their course, and that notification indicates the username of the downloader. (although there could be some privacy concerns here ...)
3. Personally, I think that all course contributors should be considered for an award regardless of whether they are MAJ members or not. Others may think differently, but as one of the organizing members of this year's Open Courseware Awards, I will lobby for your inclusion in the awards "contest" if you decide to upload a course.