Prevent Copying and Pasting

I want to hand out an MS Excel investment model to my fellow students for a university assignment. I want to prevent them from copying and SPECIFICALLY PASTING when I send out the financial model. How can I do this?

I am also trying to avoid to use VBA.

Thank you in advance.

you can lock the cells of the workbook, so they can't select them. If they can't select them they can't copy them.

I have tried that. Unfortunately, there is information / numbers that are needed to be entered in each cell. The formulae were put into each cell through data validation. I have realised that it may be prudent to block / prevent pasting.