Password protecting digitally signed documents in Adobe Acrobat X Pro

I am looking for the combination of steps to get my digitally signed documents to be password protected for secure distribution. My documents contain new "user password" information and a number of "areas" which require digital signatures to be added.
Any input as to how one would construct a document with :
one to three --> digitally signed signatures fields in one document
Password "opening" protection for the document containing the fields; both signatures and sensitive data fields
suggestions on how to make the document open to accepting more signatures without it demanding the creation of a newly saved document after being digitally signed by one signature
I have worked at this a couple of different ways but am having problems finding the right combination/sequence of steps to make it all come together.
Please assist.....
Thanks....

......meaning.......
I can't do locking of the printing or editing of the sheet after i have encrypted and signed it.  Trying to do so, wipes out out signatures. Yes, it is a great fullproof to have people be unable to change something someone has signed but if there is an ammendment, can't the creator reserve that right and in an automated sense notify the signers of the rights of the author ?
Maybe I am looking for too much but, it would be great to know if that is the reality of the whole event.
Thanks,
Robert

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