Question: Embedding Information

I was wondering if anyone was familiar with an easy way to embed or hide information into a Maple worksheet (Classic worksheet or Maple 9/9.5 standard worksheet, NOT a Maple 10 standard worksheet)? I want to be able to be able to have something equivalent to a checksum. We are producing Maple worksheets as homework for students, and I want to have something that the sudent cannot easily change to make sure that he or she is not submitting a friend's homework.
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