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This is what PDF digital signatures are for. They allow you to make sure that the PDF hasn't been tempered with. However, that is not there original intention.

This is what PDF digital signatures are for. They allow you to make sure that the PDF hasn't been tempered with. However, that is not there original intention. From what I remember the PDF standards groups are currently investigating adding something just for temper detection.

wizofaus 4y ago
Being able to place a digital signature on PDF as proof that you've read it and, for contracts, e.g. as a way of indicating your acceptance of its terms etc. would be far better than the rather absurd method used now where you can just type in your name in some fancy cursive looking font and send it back as supposed proof of your acknowledgement.
- gettalong 4y ago
  The problem with digital signatures is that you need to have an appropriate certificate to do this. If the documents are only used internally, then some self-signed certificates or a company-internal certificate authority would be fine. But usually you want an official certificate. And many certificate authorities sell such certificates but for high prices. Typing in the name or signing with a touch screen is actually considered a valid and binding, official signature in most countries. It is the lowest form of a signature equivalent to a written signature.
  - wizofaus 4y ago
    Can you use LetsEncrypt or similar free services for certificates for PDF signing? Signing using a touch screen/ mouse/scanned-in written signature at least provides some small element of protection against forgery and proof of acknowledgment - typing gives you nothing really. And yet it's what I mostly end up doing because the alternatives are too cumbersome.
    - gettalong 4y ago
      I don't think LetsEncrypt provides such a service. Additionally, the certificate must/should come from a CA that is included in the AATL (https://helpx.adobe.com/acrobat/kb/approved-trust-list1.html https://helpx.adobe.com/acrobat/kb/approved-trust-list1.html), otherwise you won't get the nice visual check mark that the signature is okay on Adobe Reader (and, let's face it, this is what most people are probably gonna be using on Windows). Agreed on cumbersome, I have a PNG file with transparency containing my signature and use Xournal++ (https://xournalpp.github.io/ https://xournalpp.github.io/) for placing it on the PDFs. That works fine but still takes more time than I want to spend. But it's faster than typing it out every time.

wizofaus 4y ago

Being able to place a digital signature on PDF as proof that you've read it and, for contracts, e.g. as a way of indicating your acceptance of its terms etc. would be far better than the rather absurd method used now where you can just type in your name in some fancy cursive looking font and send it back as supposed proof of your acknowledgement.

gettalong 4y ago
The problem with digital signatures is that you need to have an appropriate certificate to do this. If the documents are only used internally, then some self-signed certificates or a company-internal certificate authority would be fine. But usually you want an official certificate. And many certificate authorities sell such certificates but for high prices. Typing in the name or signing with a touch screen is actually considered a valid and binding, official signature in most countries. It is the lowest form of a signature equivalent to a written signature.
- wizofaus 4y ago
  Can you use LetsEncrypt or similar free services for certificates for PDF signing? Signing using a touch screen/ mouse/scanned-in written signature at least provides some small element of protection against forgery and proof of acknowledgment - typing gives you nothing really. And yet it's what I mostly end up doing because the alternatives are too cumbersome.
  - gettalong 4y ago
    I don't think LetsEncrypt provides such a service. Additionally, the certificate must/should come from a CA that is included in the AATL (https://helpx.adobe.com/acrobat/kb/approved-trust-list1.html https://helpx.adobe.com/acrobat/kb/approved-trust-list1.html), otherwise you won't get the nice visual check mark that the signature is okay on Adobe Reader (and, let's face it, this is what most people are probably gonna be using on Windows). Agreed on cumbersome, I have a PNG file with transparency containing my signature and use Xournal++ (https://xournalpp.github.io/ https://xournalpp.github.io/) for placing it on the PDFs. That works fine but still takes more time than I want to spend. But it's faster than typing it out every time.