return new PdfReport().DocumentPreferences(doc =>
            {
                // ...
                doc.ViewerPreferences(new PdfViewerPreferences
                {
                   // ...
                    ViewerPreferences = ViewerPreferences.HideMenubar | ViewerPreferences.HideToolBar
                });

.Encrypt(encrypt =>
             {
                 encrypt.WithPassword("1234");
                 encrypt.WithPermissions(new DocumentPermissions
                 {
                     AllowAssembly = false,
                     AllowCopy = false,
                     AllowDegradedPrinting = false,
                     AllowFillIn = false,
                     AllowModifyAnnotations = false,
                     AllowModifyContents = false,
                     AllowPrinting = false,
                     AllowScreenReaders = false
                 });
             })