Find copied Workbook(s)

[KausBorealis]

Hi all,
as a teacher I have a problem in remote teaching, remote homeworks.
I give a starting Workbook to my students.
Let me suppose student 1 downloads, opens, works, saves and will send back to me. It is ok.
But may be student 2 makes no work, simply asks student 1 to send the ready work.
Student 2 gets, opens, exchanges the name, and sends the workbook to me.

And now my question: is it any trace of this reopening any trace that two computers have been involved, some property perhaps?

Thanks in advance

KausBorealis

[JeteMc]

Would there be a possibility of individualizing the workbooks? Say something like hiding (i.e. text font = white) an identifier in cell XFD1048576 of one of the spreadsheets in the workbook without the students realizing it was there?

[sintek]

Perhaps a hidden sheet to populate Computer Name | User Name in cell...Populates at Save...
On Opening and Re-saving ....If computer name already populated and other pc user tries to save it does not allow this function and immediately deletes the file...