How do I prevent signatures from being edited or moved by recipients?

New Here ,
Mar 31, 2021 Mar 31, 2021

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I use Fill & Sign to add my signature, save the PDF, then send to a recipient. If a recipient opens the PDF in Acrobat, they can select Edit PDF and then they can easily move/edit/export the signature.

 

How do I prevent or restrict this?

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Most Valuable Participant ,
Mar 31, 2021 Mar 31, 2021

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Use a digital signature field instead of Fill & Sign.

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New Here ,
Apr 01, 2021 Apr 01, 2021

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I can reproduce my issue even when using the Digital Signature. After I sign and save the file, I just use the print dialogue to "Print as PDF", which turns the digiatal signatures into editable images just like the Fill & Sign method.

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Adobe Community Professional ,
Apr 02, 2021 Apr 02, 2021

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You can't avoid this.

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Most Valuable Participant ,
Apr 02, 2021 Apr 02, 2021

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After you sign the file you can apply a security policy to prevent printing. Also, if the user does what you described the new file is not going to be digitally signed any longer.

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Most Valuable Participant ,
Apr 02, 2021 Apr 02, 2021

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"which turns the digiatal signatures into editable images just like the Fill & Sign method."

No, it doesn't. It really doesn't. This is a common misunderstanding of digital signatures.


A digital signature is not what you see on the page; it is based on a certificate, and can tell with absolute certaintly whether a PDF has been changed since it was signed. If the PDF is changed in any way, the signature is either gone, or invalid. Sure, there is a mark on the page. 


Remember, you CANNOT trust marks on a page. With no special software, anyone can "lift" a signature from anywhere and stick it on any document. They can in seconds make a copy of a file and change the signatures. Faking is so easy, that digital signatures are an absolute must. With digital signatures, the fake won't have a valid signature.

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