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Insert signature into word for mac 20114/12/2023 ![]() A signature does not add real protection to a PDF, but Acrobat plays along with this scheme by trying to not allow changes that would invalidate the signature, and logging all modifications to the PDF.ฤก) There are ways to maintain the visual appearance of the signature on the page. The signature can be selectively applied so that the certain types of changes are allowed. Obviously it gets a lot more complext then this. The real stuff is going on inside the PDF where you can't see it. That stuff that's shown on the signature field is irrelevant. A valid signature ensures that the document hasn't changed since the signature was applied. If the document is changed in any way the checksum changes, so the signature becomes invalid. In the simplest sense a digital signature is a special checksum of all the bytes in the bytes in the PDF combined with all the bytes in the digital signature. ![]()
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