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Level 4

Got a question about the "Clear Signature":

suppose I have a stand-alone (a pdf file, not in the WorkSpace) PDF form with 2 Signature fields,

each Signature locks a few fields on the form,

user A signs his Signature, gives the PDF file to user B, and user B signs it also, then returns the file back to A.

now, A right-clicks on the Signature and selects the "Clear Signature", and all his fields are unlocked,

then A makes some changes to his fields, and signs it again.

so, now the form has some new data, with an old Signature signed by B.

that's a problem, because B might not agree with the new data.

How to prevent this from happening?

i.e. is there a way to prevent A from altering the form after B has signed it?

thanks