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When a form is digitally signed, the signature is added
to a signature field. Forms must include a signature field before
they can be signed.
Multiple signature fields can be added to a single form. Each
signature field can be associated with a set of fields on the form.
After the signature is added, the associated fields are locked.
These types of signatures are known as MDP+ signatures. To
use this feature with PDF forms and XML forms, users must use Acrobat or
Adobe Reader 8.0 and later to open the forms.
Seed value dictionaries can be added to signature fields to configure
how the field is used when the document is signed. For example,
a list of signing reasons can be provided, or the hashing algorithms
that can be used for creating the document digest can be specified.
You can add signature fields at design time or at run time:
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