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📄 Encryption.vb

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📄 FontDemo.vb

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📄 ImageDemo.vb

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📄 LineDemo.vb

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📄 OutlineDemo.vb

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📄 Permission.vb

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📄 RawImageDemo.vb

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📄 SlideShowDemo.vb

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📄 TextDemo.vb

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✏️ Editing: Encryption.vb

Imports HPdf

Module Encryption

Sub Main()
        Const owner_passwd As String = "owner"
        Const user_passwd As String = "user"
        Const text As String = "This is an encrypt document example."
        Console.WriteLine("libhpdf-" + HPdfDoc.HPdfGetVersion())

Try
            Dim pdf As HPdfDoc = New HPdfDoc()

' create default-font 
            Dim font As HPdfFont = pdf.GetFont("Helvetica", Nothing)

' add a new page object. 
            Dim page As HPdfPage = pdf.AddPage()

page.SetSize(HPdfPageSizes.HPDF_PAGE_SIZE_B5, HPdfPageDirection.HPDF_PAGE_LANDSCAPE)

page.BeginText()
            page.SetFontAndSize(font, 20)
            Dim tw As Single = page.TextWidth(text)
            page.MoveTextPos((page.GetWidth() - tw) / 2, (page.GetHeight() - 20) / 2)
            page.ShowText(text)
            page.EndText()

pdf.SetPassword(owner_passwd, user_passwd)

' save the document to a file 
            pdf.SaveToFile("Encryption.pdf")

Catch ex As Exception
            Console.Error.WriteLine(ex.Message)
        End Try
    End Sub
End Module

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✏️ Editing: Encryption.vb