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Can you create a form in which its never possible for the same person te sign the form more than once.

2015-10-11   Views:0

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Hi, I've been looking into this for awhile and believe the answer is 'no' but was just wondering if anyone here would know of a solution. The company I work for has a formulier on which a number of Excel files are placed. This form is then sent to a

Hi, I've been looking into this for awhile and believe the answer is 'no' but was just wondering if anyone here would know of a solution.
The company I work for has a formulier on which a number of Excel files are placed. This form is then sent to a five (often different) people who are then required to open the Excel files and if accord to place their digital signature. We would like to make sure that no one is able to sign the form more than once and also if possible to make sure they have opened the Excel files. It would be great if anyone had any tips...
All the very best,
Martin Angell

The replay answer
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I am not an Excel or Excel-to-PDF conversion expert, so I do not know how Excel forms are converted to PDF form fields. With this caveat here's what I do know.
In Acrobat It is possible to create a PDF form in which there are JavaScripts associated with fields (any fields, including signature fields). These JavaSripts can do a lot of things, including checking the signer's certificates on the already signed signature fields. Then you can make all unsigned signature fields read-only, in which case the user will not be able to actually sign them. After that you can overlay a button field on top of each unsigned signature field with exactly the same dimensions and associate a JavaAcript with this button field. This JavaScript would put up an UI asking the user for the signing certificate and its password, check this certificate's CN against the list of already signed signature fields and initiate the signing of the unsigned signature field behind this button if your condition is satisfied.
I never tried that myself but it could work. This looks complicated and it is but if you really want it you can try.

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