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Set Permissions and Password of the Generated PDF Document

EVO PDF Client for .NET Core

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
C#
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

// Use EVO PDF Namespace
using EvoPdfClient;

namespace EvoHtmlToPdfDemo.Controllers.PDF_Creator.PDF_Security
{
    public class PDF_Creator_PDF_Permissions_and_PasswordController : Controller
    {
        [HttpPost]
        public ActionResult CreatePdf(IFormCollection collection)
        {
            // Get the server options
            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string servicePassword = collection["textBoxServicePassword"];
            bool useServicePassword = servicePassword.Length > 0;
            bool useTcpService = collection["ServerType"] == "radioButtonUseTcpService";
            string webServiceUrl = collection["textBoxWebServiceUrl"];

            // Create a PDF document
            Document pdfDocument = null;
            if (useTcpService)
                pdfDocument = new Document(serverIP, serverPort);
            else
                pdfDocument = new Document(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                pdfDocument.ServicePassword = servicePassword;

            // 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 (collection["EncryptionKey"] != "bit128RadioButton" || collection["EncryptionType"] != "rc4RadioButton")
            {
                // set the encryption algorithm
                pdfDocument.Security.EncryptionAlgorithm = collection["EncryptionType"] == "rc4RadioButton" ? EncryptionAlgorithm.RC4 : EncryptionAlgorithm.AES;

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

            // Set user and owner passwords
            if (collection["userPasswordTextBox"][0].Length > 0)
                pdfDocument.Security.UserPassword = collection["userPasswordTextBox"];

            if (collection["ownerPasswordTextBox"][0].Length > 0)
                pdfDocument.Security.OwnerPassword = collection["ownerPasswordTextBox"];

            // Set PDF document permissions
            pdfDocument.Security.CanPrint = collection["printEnabledCheckBox"].Count > 0;
            pdfDocument.Security.CanPrintHighResolution = collection["highResolutionPrintEnabledCheckBox"].Count > 0;
            pdfDocument.Security.CanCopyContent = collection["copyContentEnabledCheckBox"].Count > 0;
            pdfDocument.Security.CanCopyAccessibilityContent = collection["copyAccessibilityContentEnabledCheckBox"].Count > 0;
            pdfDocument.Security.CanEditContent = collection["editContentEnabledCheckBox"].Count > 0;
            pdfDocument.Security.CanEditAnnotations = collection["editAnnotationsEnabledCheckBox"].Count > 0;
            pdfDocument.Security.CanFillFormFields = collection["fillFormFieldsEnabledCheckBox"].Count > 0;

            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";
            }

            // Create a HTML to PDF element to add to document
            HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(collection["urlTextBox"]);

            // 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 file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            fileResult.FileDownloadName = "Set_Permissions_Password.pdf";

            return fileResult;
        }

        private bool PermissionsChanged(Document pdfDocument)
        {
            return !pdfDocument.Security.CanPrint || !pdfDocument.Security.CanPrintHighResolution ||
                    !pdfDocument.Security.CanCopyContent || !pdfDocument.Security.CanCopyAccessibilityContent ||
                    !pdfDocument.Security.CanEditContent || !pdfDocument.Security.CanEditAnnotations ||
                    !pdfDocument.Security.CanFillFormFields;
        }
    }
}