Locking a Sales Quotation Template

You can create a Sales Quotation Template which is a great idea. However, we need to be able to ‘lock’ the template so it can’t be modified. How can we achieve this?

Second, we still want to duplicate the template and be able to modify the duplicate, but not the original.

Any ideas on how to achieve this?

I have looked at permissions but I can’t see they will help in this case.

You can achieve this by setting readonlyIf condition on form.