Set the user password with encrypted PDF file when you loading the PDF file.
ImageViewer1.PDFUserPassword[=String]
Parameter String the string of user password.
Remark This property is Read/Write.
Example
Visual Basic Syntax ImageViewer1.FileName="c:\test.pdf" If ImageViewer1.PDFIsEncrypted and ImageViewer1.FileWidth =0 then ImageViewer.PDFUserPassword="yourpass" ImageViewer1.FileName="c:\test.pdf" endif