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When a form is rendered to PDF, any digital signatures
that it contains are invalidated. Ensure that PDF forms are not
rendered after they are digitally signed. You can prevent rendering
when you use static Adobe PDF forms or Adobe XML Forms.
Static Adobe PDF formsUse Designer to create static Adobe PDF
forms so that rendering occurs only the first time they are opened
in Acrobat or Adobe Reader.
If you are using the Forms service
to merge data with the form, prevent the service from converting
the form to a dynamic PDF form. Use Designer to configure the following
form properties:
- Target Version:
- Specify Acrobat And Adobe Reader 8.0 or Later
- PDF Render Format:
- Specify Static PDF Form
For information about setting
form properties, see Designer Help.
If you are using
the form with the User service in a process, use a Document Form variable
to store the form data and the form data. Configure the Document
Form variable so that the render service is called only once. (See Workbench Help.)
Adobe XML FormsAdobe XML forms (XDP files) can be rendered
to PDF by using the Forms service. To use the Signature service
with Adobe XML forms, the Forms service must be configured so that
rendering occurs on the server, and not on the client. When rendering
occurs on the server, the rendered PDF form is embedded in the XDP file
and is not rendered again.
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