Signature preferences in Acrobat form

Hi everyone,

I would like to make an adobe form on which my workes will be able to sign with their smart cards.

At the moment, when they sign, anyone who sees the filled form, can see the worker's ID, which is a privacy issue.

Is there a way that I can change the preferences of the original form (not that every worker would have to do it himself) so that I'll be able to see the name of the worker, but not his ID?

thanx!