You can make any field read only by removing the field from the Edit screen. If you leave it on the View screen, the user will be able to see it but not change it. If you remove it from the View screen, they will not see it.
Unfortunately, it will have to stay on the Create screen then. You might add a Tab to the screen and call it System or something like that. Then move the field to under the tab. It will be harder for the user to see when creating.
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