Sure it is. The first signature field can be used to lock all the fields in the file, except for the other signature field.
The client will then only be able to sign it again. They won't be able to edit anything else in it.
Thank you try67. Can you reference any instructions to achieve this? Thanks in advance.
After you create your Digital Signature field, right-click it (still in Form Edit mode), select Properties and then switch to the Signed tab.
You'll see several options there. Select the second one ("Mark as read only") and then "All fields except these" and from the list pick the other signature field: