Removal of signatures in a digital signature field

Hi all, I have a question about the above topic that I hope
you guys can help me

(1) is it possible to remove the digital signatures of the form? For example
If you have a form go through several stages of approval requiring
signatures and then a step that happened to reject, it would be good to
remove the previous signatures so that they can be signed again.

(2) and finally is there a simpler way to combine digital signatures
and the management of rights, then what appeared in the pdf document provided by
Duane (second post from the bottom of the thread)? When creating a policy, there is

a checkbox for "filling in form fields and signing." This forsomething's else?

Thank you!
Billy

(1) is it possible to remove the digital signatures of the form?

ANSWER: A signature can not be removed ("unsigned") if the system or the user has access to the "private" key used to generate the signature in the first place.  For example, let's say that signs of the user has a PDF file... Only the user can unsign this PDF.  If you were to use LC Digital Signatures ARE to "unsign" a PDF file, you will need to have all the 'Powers' potential user and passwords of credentials stored in the store of approvals for LC would have access to private keys to unsign a signature field.  It's not very feasible if the number of potential signatories.

(2) at - it a simpler way to combine the rights management and digital signatures

ANSWER: The combination digital signatures and rights management is not complicated.  You just need to be aware of the "order of operations" required.  Always 'Encrypt' everything first (rights Mgt, certificates and password can be used for encryption) "Certify" (assuming you certify the PDF), then add rights of Extension of the detector (assuming you want to extend the functionality of the document for the reader)

The reason why the above order is necessary...  When you sign a document, a hash is generated according to the document, if you then encrypt the signed document, you change the document, which in turn a different hash to be generated... This breaks the signature.

With regard to the "filling of form fields and signing" policy option, it's a 'permission' that you can enable or disable PDF forms with a strategy applied by RM for example, A PDF has a policy applied where the user has 'filling in form fields and signing' andf enabled permission, user B does not work.  A user can open the screen and interact with him by filling and or sign the form.  User B would be able to 'see' the form.  This permission is relevant only with RM in order to protect the PDF Forms.  Also, it should not be confused with the permission of Reader Extensions to allow Digital Signatures in Reader.

For example, if you wanted a form of 'Certified' must be filled out and signed by the user with Adobe Reader, you will need to:

Apply a policy to the PDF document where the user has been "filling in form fields and signing" permission enabled, then apply a signature to "Certify" who had permission from "Allow complete and sign form" enabled, then drive to extend the PDF form that allows the authorization of "Digital Signatures" that activates the functionality of Digfital Signatures in the drive for this particular form.

It may seem complicated, but it's really not

Concerning

Steve

Tags: Adobe LiveCycle

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