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There are a few limitations related to the usage of digital signatures in RadPdfProcessing.

  • Exporting a document that is signed must be done using a stream that supports reading.

  • The validation of a signature depends on the bytes representing the document. Thus, to validate a signature, the stream used to import the document must be still open.

  • The validation is always performed for the current field, against the state of the document at the moment of importing.

  • At this point, RadPdfProcessing supports only the signing of a document that does not contain a signed signature field. Signing a document containing a signed signature field will result in invalidation and corruption of the existing signature.

  • RadPdfProcessing currently supports only the signing of a single signature field. Signing more than one signature field will result in the invalidation of all signatures except the last one.

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