How do you make a text field Read Only after it is saved and distibuted?

How do you make a text field read only after it is saved and distibuted?

LiveCycle Designer ES 8.2

This JavaScript code on the exit event:

textField1.access = "readOnly";

This works after the user loses focus on the field, however after it is saved and distributed, that field is no longer "read-only".

I need to have staff insert information into a text field and then distribute it out to customers, and those fields have to be protected.

How do you do this?