Thank you for the ideas. Both are doable. I will look into them.
Joe Gwinn wrote: > One possible solution jumps to mind, a Hill Cipher... >
David Bailey wrote: > My solution would be to write your notebook with answers, but tag the > cells that contain answers. With that structure, a simple program could > copy the notebook excluding or including the relevant cells based on the > tagging information. That way, the current CDF files simply won't > contain the answers however devious your students are!