# About digital signatures

Take advantage of the following new functions that have been added to the digital signatures feature:

- Enable signatures for the entire form, or for specific sets of data in the form that can be signed separately.
- For each set of data that can be signed, specify whether a single or multiple signatures are allowed and what their relationship will be. For example, you can specify whether they are parallel cosignatures or whether each new signature countersigns all the earlier ones.
- Specify a message to be shown to form users as they sign the form.
- Insert and see a signature in the document, and view the form as it was presented to each signer.
- View verifiable nonrepudiation information that has been added to each signature for increased security. This additional information is part of the signature and cannot be removed without invalidating the signature. At any time, you can recall this data by clicking on the signature in the form.
- Add custom information to the signature block in fully trusted forms through an extensive digital signature object model.
- Access a signature through a snapshot. The snapshot is a file in .png format. It contains a view of the signature within the form and has all its nonrepudiation information.

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