Adobe 9: Can a PDF be modified that has been digitally signed?

Is it possible to insert or remove pages from a PDF (in Adobe 9) after another user has already placed a digital signature in it? (This isn't a certified digital signature.) It appears that Adobe 9 does not allow a user to make modifications to a pdf that has been digitally signed while earlier versions did.

Steve,
To answer your question, yes, we do need that capability.
Here is a synopsis of what we want to achieve:  after signatures take place, to replace specific documents with revised pages containing digital signatures.
We have a temporary workaround in that we can print the PDF with digital signatures to another PDF; however, we lose the green checkmarks in the digital signatures when we do this.
-Carla

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