Limitations
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. To ensure compatibility, always use a stream that supports both reading and writing when exporting signed documents with Telerik.
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.