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At present, we do not have PdfViewer control in ASP.NET. But
we can view the pdf document as images in ASP.NET by using ExportAsImage
available with PdfViewer.Windows.
Attached a simple sample on this.
Regarding the encryption of pdf document, it is not possible
to encrypt a pdf document with PdfViewer, but can be done by using our Pdf library.
Please find the online sample in the below link.
Please, let us know if you need any further assistance.