Help with wordpress website

We use a LMS to serve solution files to users on our website. It is wordpress. What we do at the moment is create swf files for documents and then embed them on solution page which only enrolled users can access. but we are facing these issues: Since file (.swf) is embedded directly from a directory on server, enrolled user can see the source and save our file. We want that enrolled users can see those files, but must not be able to see or download them for distribution. Obfuscating the link somehow might work. We are open to switch to another format than .swf if needed. Purpose is to stop users from saving or copying our documents. Kindly inbox with proposed solution for this problem, like what you will do about it and we can discuss this further. Please note we are totally open to new suggestions but our purpose remains the same.