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Set Passwords and Permissions for PDF | VB.NET
Program.vb:
VB
Imports Bytescout.PDF ''' <summary> ''' This example demonstrates how to lock the document with a password. ''' PDF format supports two kinds of passwords: owner and user password. ''' User password allows to view document and perform allowed actions. ''' Owner password allows everything, including changing passwords and permissions. ''' </summary> Class Program Shared Sub Main() ' Create new document Dim pdfDocument = New Document() pdfDocument.RegistrationName = "demo" pdfDocument.RegistrationKey = "demo" ' If you wish to load an existing document uncomment the line below And comment the Add page section instead ' pdfDocument.Load(".\existing_document.pdf") ' Add page pdfDocument.Pages.Add(New Page(PaperFormat.A4)) ' Set document encryption algorythm pdfDocument.Security.EncryptionAlgorithm = EncryptionAlgorithm.RC4_40bit ' Set various user permissions pdfDocument.Security.AllowPrintDocument = False pdfDocument.Security.AllowContentExtraction = False pdfDocument.Security.AllowModifyAnnotations = False pdfDocument.Security.PrintQuality = PrintQuality.LowResolution ' Set owner password pdfDocument.Security.OwnerPassword = "ownerpassword" ' Set user password pdfDocument.Security.UserPassword = "userpassword" ' Save document to file pdfDocument.Save("result.pdf") ' Cleanup pdfDocument.Dispose() ' Open document in default PDF viewer app Process.Start("result.pdf") End Sub End Class