How to lock specific fields in a PDF

I am creating a performance review PDF for my job, and I am trying to find out how to make the fields read only after the manager signs, but will still allow the employee to still sign the document, but will not allow any edits to be made except the signatures.  I am not sure if it is a script or a specific program that can do this and how?

Thank you
Brian PlunkettAsked:
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I know that in Adobe Acrobat XI Pro (the only version I have used) it is possible to use digital signatures in a form to allow editing of some fields, and disable others.

You can open Tools>Forms and click Edit to change the form you are working on
Add a digital Signature field (not the basic field, this one uses a digital certificate)
Double-click on the newly created digital signature field to open properties, and click the "Signed" tab
Click "Mark as Read only" and select "Just these fields" and select the fields you want to lock down
Click "Pick" and select the first signer's field, then click OK to view the fields selected
After reviewing the fields, and when you are done editing, click File>Save as Other> Reader Extended PDF>Enable More Tools
Click Save Now
The form fields should be editable at this point
When reviewing the document in Adobe Reader, the first signature can be input with a digital signature and then saved; after which only fields not locked down (extra signatures) will be editable

Please mark this as answered if this works for you! I haven't done it in a while but it worked back then

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Brian PlunkettAuthor Commented:
Works perfectly I was able to do it in Acrobat Pro X, but your instructions were spot on.  Thank You :-)
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