PDF encryption options
[SerializableAttribute()]
public class PDFSecurityOptions
<SerializableAttribute()>
Public Class PDFSecurityOptions
[SerializableAttribute()]
public ref class PDFSecurityOptions
The PDFSecurityOptions class is used as the type for the SecurityOptions and used to read and write the security and encryption options to use with PDF files.
When reading PDF documents, PDFDocument.SecurityOptions will always be populated automatically when the PDFDocument object is initialized.
When writing PDF documents, the following methods of the PDFFile class will use the security options set in PDFFile.SecurityOptions when updating or created a PDF file:
If the value of PDFFile.SecurityOptions is null, then the PDFFile will not encrypt the result PDF file.
There are two different ways to protect a PDF file with a password:
By using a user password set in UserPassword. In this mode, external viewers such as Adobe Acrobat will ask the user for the same password when opening the file for viewing. If the correct password is supplied, then all operations and rights are granted.
By using an owner password set in OwnerPassword. In this mode, external viewers such as Adobe Acrobat will ask the user for the same password when opening the file for viewing. If the correct password is supplied, the editor will check the various access rights properties to allow or disallow certain operations on the PDF file such as printing or editing.
You cannot use both UserPassword and OwnerPassword in the same PDF file. If both values are set, then the PDFFile object will use OwnerPassword and ignore UserPassword.
This example will re-encrypt a PDF file with an owner password and restrict printing.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Controls;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.Pdf;
using Leadtools.Svg;
using Leadtools.WinForms;
public void PDFFileSecurityOptionsExample()
{
string sourceFileName = Path.Combine(LEAD_VARS.ImagesDir, @"Leadtools.pdf");
string destinationFileName = Path.Combine(LEAD_VARS.ImagesDir, @"LEAD_EncryptedNoPrint.pdf");
PDFFile pdfFile = new PDFFile(sourceFileName);
// Set the security options
pdfFile.SecurityOptions = new PDFSecurityOptions();
pdfFile.SecurityOptions.UserPassword = "LEAD";
pdfFile.SecurityOptions.PrintEnabled = false;
pdfFile.SecurityOptions.HighQualityPrintEnabled = false;
pdfFile.SecurityOptions.EncryptionMode = PDFEncryptionMode.RC128Bit;
// Encrypt the file by saving it to the destination file
pdfFile.Convert(1, -1, destinationFileName);
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Pdf
Imports Leadtools.WinForms
Imports Leadtools.Svg
Imports Leadtools.ImageProcessing
Public Sub PDFFileSecurityOptionsExample()
Dim sourceFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf")
Dim destinationFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "LEAD_EncryptedNoPrint.pdf")
Dim pdfFile As PDFFile = New PDFFile(sourceFileName)
' Set the security options
pdfFile.SecurityOptions = New PDFSecurityOptions()
pdfFile.SecurityOptions.UserPassword = "LEAD"
pdfFile.SecurityOptions.PrintEnabled = False
pdfFile.SecurityOptions.HighQualityPrintEnabled = False
pdfFile.SecurityOptions.EncryptionMode = PDFEncryptionMode.RC128Bit
' Encrypt the file by saving it to the destination file
pdfFile.Convert(1, -1, destinationFileName)
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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