How can I apply page watermarks to digitally signed documents
When printing a digitally signed PDF I need to apply a watermark across each page that states the hardcopy is an uncontrolled version of the document. I understand how to allow updates to specific form fields after the document has been signed, but cannot find a way to allow the application, removal, or modification of page level watermarks after the document has been signed.
I do not want to invalidate the digital signature when applying a watermark.
The use case is when a user prints a hardcopy of a digitally signed SOP, a watermark needs to be placed on the page that states the hardcopy is an un-controlled document, the print date, and an expiration date.
I realize that any change to a digitally signed document is normally considered to be an operation that invalidates the signatures. However, it is possible to specify fields that may be changed AFTER the signatures are applied without invalidating the signature. I am looking for the same capablity with watermarks.
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public class FileProcessing
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