EVO HTML to PDF Converter

Set Permissions and Password of the Generated PDF Document

EVO HTML to PDF Converter for .NET Documentation

EVO HTML to PDF Converter allows you set the permissions of generated PDF document like printing and editing and to password protect the generated PDF document with separate user and owner passwords.

The PDF security options can be set in DocumentSecurity object. The possible options are detailed below.

PDF Security Options

Code Sample - Set Permissions and Password of the Generated PDF Document
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protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a PDF document
    Document pdfDocument = new Document();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    // Add a page to PDF document
    PdfPage pdfPage = pdfDocument.AddPage();

    // Set the encryption algorithm and the encryption key size if they are not the default ones
    if (!bit128RadioButton.Checked || !rc4RadioButton.Checked)
    {
        // set the encryption algorithm
        pdfDocument.Security.EncryptionAlgorithm = rc4RadioButton.Checked ? EncryptionAlgorithm.RC4 : EncryptionAlgorithm.AES;

        // set the encryption key size
        if (bit40RadioButton.Checked)
            pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey40Bit;
        else if (bit128RadioButton.Checked)
            pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey128Bit;
        else if (bit256RadioButton.Checked)
            pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey256Bit;
    }

    // Set user and owner passwords
    if (userPasswordTextBox.Text.Length > 0)
        pdfDocument.Security.UserPassword = userPasswordTextBox.Text;

    if (ownerPasswordTextBox.Text.Length > 0)
        pdfDocument.Security.OwnerPassword = ownerPasswordTextBox.Text;

    // Set PDF document permissions
    pdfDocument.Security.CanPrint = printEnabledCheckBox.Checked;
    pdfDocument.Security.CanPrintHighResolution = highResolutionPrintEnabledCheckBox.Checked;
    pdfDocument.Security.CanCopyContent = copyContentEnabledCheckBox.Checked;
    pdfDocument.Security.CanCopyAccessibilityContent = copyAccessibilityContentEnabledCheckBox.Checked;
    pdfDocument.Security.CanEditContent = editContentEnabledCheckBox.Checked;
    pdfDocument.Security.CanEditAnnotations = editAnnotationsEnabledCheckBox.Checked;
    pdfDocument.Security.CanFillFormFields = fillFormFieldsEnabledCheckBox.Checked;

    if ((PermissionsChanged(pdfDocument) || pdfDocument.Security.UserPassword.Length > 0) &&
        pdfDocument.Security.OwnerPassword.Length == 0)
    {
        // A user password is set but the owner password is not set or the permissions are not the default ones
        // Set a default owner password
        pdfDocument.Security.OwnerPassword = "owner";
    }

    try
    {
        // Create a HTML to PDF element to add to document
        HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(urlTextBox.Text);

        // Optionally set a delay before conversion to allow asynchonous scripts to finish
        htmlToPdfElement.ConversionDelay = 2;

        // Add the HTML to PDF element to document
        pdfPage.AddElement(htmlToPdfElement);

        // Save the PDF document in a memory buffer
        byte[] outPdfBuffer = pdfDocument.Save();

        // Send the PDF as response to browser

        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Set_Permissions_Password.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Close the PDF document
        pdfDocument.Close();
    }
}