OptionalfirstTry an empty password before consulting passwordProvider. Default: true.
OptionalpasswordSupplies passwords for encrypted documents; see PdfPasswordProvider for retry semantics.
OptionalsourceIdentifier used in error messages and for caching purposes.
OptionaluseLoad only the first page eagerly; call PdfDocument.loadPagesProgressively for the rest.
Common options for the document-opening methods of PdfrxEngine.