PdfProcessing: ArgumentException is thrown when trying to clone document containing SignatureField
Trying to clone the Signature of a SignatureField leads to InvalidOperationException as the FieldName of the cloned signature is already set.
Posted on:09 Oct 2019 13:11
Thank you for sharing your feedback. Each feedback is important for us in order to improve our products.
Indeed, the digital signature is designed to validate the PDF content and any changes to the document would invalidate it. In order to track such scenarios when merging, the PDF documents can be observed if contain any signed signature fields. If so, the signature of the signature fields can be set to null before the merge and the resultant document can be signed after the merge is completed. This way the document content may be merged without producing any invalid signature. I will write your suggestions in the internal item as notes to make sure they will be considered when the development of the item is started.
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Posted on:02 Oct 2019 16:03
Thinking about this issue, I'm not sure if it will be easily resolvable as my understanding is files with a signature can't be edited. Merging with another document using PDFProcessing counts as editing and that is how we encountered this issue.
Perhaps a way in PDFProcessing code or otherwise to detect a file with a signature before attempting editing? Or at least a specific exception that is thrown when a file with a signature is encountered so that event could be easily trapped.
More and more people/businesses are signing their documents these days so handling these documents is becoming increasingly important.