Flattening a digitally signed PDF document

If you try to flatten an interactive XFA PDF document that contains a signed signature field and set the renderAtClient run-time option to true, the resultant PDF document is not flattened. That is, the document remains interactive and the fields within the PDF document let users enter and modify data. This behavior occurs because the renderAtClient run-time option should be used when the input to an Output service operation is a form design (an XDP file), not a PDF file. To successfully flatten a digitally signed PDF document, set the renderAtClient run-time option to false.

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