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Theres a few ideas but as we know students are sneaky and they will always find a way to cheat.
Add iProperties Author
Add a watermark to the print. (But name can be changed)
Print to PDF with watermarked name
Using Vault Basic system you can see who checked drawings in and out.
Unfortunately there is not a way yet to prevent students from cheating.
Do you students log in to the machines? If so, you might check the iProperties.
Somewhere I also have a program that indicates the original "name" of a file if it was renamed.
This isn't the name the student gives the file but some sort of code that Inventor assigns to the file.