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Acrobat also “validates” the signature meaning that if the PDF is altered in any way after you apply that electronic signature, a warning box tells you that the “signature is invalid.” I don’t suggest that this is the ultimate is authenticity, but it is enough to raise the question if you need to investigate if someone altered the PDF after it was “signed.” It’s still a long way from a true, encryption-based digital signature, but it’s an excellent step forward. You can customize the “appearance” of the signature in Acrobat which could include text such as the date to accompany the scanned image of your signature. The big difference, however, is that Acrobat allows you to make that signature a little more sophisticated and trustworthy. You have to jump through a few more steps to do the same in Adobe Acrobat. In fact, PDFpen offers a simple workflow to create a transparent background on your signature.
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