You could use seed value to ensure the signer of the signature field is a specific individual (or an individual from a select group), but you would have to have the public key certificate for each individual and I have the feeling (based on your newbie comment) that might be a bit much to ask of you.
However, I do applaud your work in document authoring and in trying to institute digital signatures in your work environment.
Steve, please further explain using seed value to ensure the signer of the
signature field is a specific individual(or individual from a
select group)? Also could you elaborate on needing to have a public key
certificate for each individual? An explanation would expand my knowledge
of Adobe Acrobat 9. I'll wait for your response. Thank you.