General cheating story: My wife is a professor (ya that again:>). As an accounting professor they do a lot of their homework/projects in excel. Excel, of cours

General cheating story: My wife is a professor (ya that again:>). As an accounting professor they do a lot of their homework/projects in excel. Excel, of course, saves the information of the document creator in it's meta-data which is trivial to look-up. She'll routinely get 5 or 6 of the exact same file (with the same origination data) for the same project. Overall, she'll catch 10%-20% of her class cheating in a given semester without even really trying.