Digitally signing a PDF doc in more than one place by one signatory.

We sent contracting individual's a PDF version of agreements for signature. THey currently print, sign and return.
The document contains more than one agreement, so needs signing in 6 or 7 places.
Is it possible to pre-locate the place/s where the electronic signatures can be placed when designing the pdf documetns, so that a recipient can 'sign' it once, but all the necessary places show the 'digital' signature?
I expect not, and that the solution is to prepare a digital signature only version of the docs that needs signing in only one place.
Thanks
John

Hi Peter,
Believe me that I know as well as anyone how complex PKI can be. No matter how simple we try to make adding a digital signature in Acrobat/Reader there are some immutable facts. One of those is we have to absolutely, positively guarantee that the digital signature covers exactly what the signer intended. The only way to do that is commit the signed bytes to disk before completing the signature, and that requires a Save operation. Early on when digital signatures were first introduced in Acrobat we did do the signing operation on the bytes in memory, but the risk was too great for someone slipping in bytes that the signer did not intend to sign. If there were no bad guys we could get away with signing in memory, but alas, the risk of data compromise is too great to do that today. If we were to go back to that method we would be excoriated by the cryptographic community for allowing a hole into which bad data could be injected.
Beginning with Acrobat/Reader 9 we did change the UI so if there is nothing other than a subsequent signature the change won't be as obvious. The user would have to dig into the Signature Navigation Panel in order to track down the change.
Steve

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