Locking files so they can be opened but not saved in a modified state on another machine

I'm creating a batch of files for trainees in my work environment to help them learn an application.  I'm trying to lock the files so they always start out in the same state I left them in.  I want the students to be able to open the files, work in them, but NOT accidentally hit "SAVE" before closing out, thereby modifying them, preventing the next student who opens them from having the same clean slate the first one had. 
I've tried locking the files in "GET INFO", and I've tried changing Privileges from "read & write" to "read" only for all fields.  This works on the computer on which I created the projects, but the locks and privilege changes are gone when I copy the files to students machines, email them or otherwise transport them off the original machine on which they were created.  It's not practical to go to each students machine and manually relock and change privelages there.  These projects have to be distributed to many Macs in many locations. 
As a fall back position, is there a way of locking, and/or changing the "read & write" option to "read" on multiple files at the same time so it isn't necessary to open each of about 50 files on each students machine and manually lock them?
Thanks.

If they don't need to edit them, save them as PDFs.
If they do need to edit them, mark them as Stationary. When you open a piece of Stationary, you get a new, untitled copy of the original document.  I suppose they might be able to still save over the top of the original stationary, but not without warning.
You can set the permissions for all the documents within the same folder by using the "Apply to Enclosed" command in the Gear menu in the Get Info dialog. Set the folder to Read Only, then Apply to Enclosed. You could still use the Stationary trick as that would create a new, untitled copy that has to be saved somewhere else, and would likely remove the "you can't edit this file" dialogs.
I think the command line copy utilities may be able to copy without changing permissions. Look for info on cp or ditto.

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