Ok I see it but how do I copy it into my form? Or do I need to write a script for it?
Also should I be using LiveCycle instead of Acrobat Pro for this function?
Did you create the form in LiveCycle Designer (XFA Forms)? Or in Acrobat (AcroForms)?
The solution I posted is for forms created in LiveCycle Designer.
You will be able to lock fields in AcroForms, but I think you would need to target each field individually (eg a different solution to the one posted). If you have created your form in Acrobat, you may get better advice on the Acrobat forums.
Hope that helps,
Created it in Acrobat X Pro