Java에서 PDF를 암호로 보호하는 방법

IronPDF - Java PDF Library

IroqPDF Java PDF Library is a Java library for working with PDF documents. It provides a wide range of features for generating and manipulating PDFs, including the ability to add text, images, and other types of content, and control the layout and formatting of the document. It also provides a number of important features for securing PDF content, such as using password protection features in IronPDF.

Steps to Protect PDF using Password in Java Applications

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.metadata.MetadataManager;
import com.ironsoftware.ironpdf.security.PdfPrintSecurity;
import com.ironsoftware.ironpdf.security.SecurityManager;
import com.ironsoftware.ironpdf.security.SecurityOptions;

import java.io.IOException;
import java.nio.file.Paths;
import java.util.Date;

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.metadata.MetadataManager;
import com.ironsoftware.ironpdf.security.PdfPrintSecurity;
import com.ironsoftware.ironpdf.security.SecurityManager;
import com.ironsoftware.ironpdf.security.SecurityOptions;

import java.io.IOException;
import java.nio.file.Paths;
import java.util.Date;

// Set your IronPDF license key
License.setLicenseKey("Your license key");

// Set your IronPDF license key
License.setLicenseKey("Your license key");

Open an Encrypted PDF Document

The following code snippet will open a document that was encrypted with the password "password":

// Load an encrypted PDF file using its password
PdfDocument pdf = PdfDocument.fromFile(Paths.get("encrypted.pdf"), "secretPassword");

// Load an encrypted PDF file using its password
PdfDocument pdf = PdfDocument.fromFile(Paths.get("encrypted.pdf"), "secretPassword");

In the above code snippet, an encrypted PDF file is opened with the password "password".

Opening an Encrypted PDF document

Encrypt PDF Document using Password Protection

Let's change the owner password of the "encrypted.pdf" file, which was opened in the previous step. The following code helps to achieve this task:

// Change or set the document owner password
SecurityManager securityManager = pdf.getSecurity();
// Remove existing passwords and encryption from the document
securityManager.removePasswordsAndEncryption();
// Set a new password for the document
securityManager.setPassword("secret-key");

// Change or set the document owner password
SecurityManager securityManager = pdf.getSecurity();
// Remove existing passwords and encryption from the document
securityManager.removePasswordsAndEncryption();
// Set a new password for the document
securityManager.setPassword("secret-key");

The first step is to remove the password using the removePasswordsAndEncryption method, and then set a new password using the setPassword method.

// Save the secured PDF document
pdf.saveAs(Paths.get("assets/secured.pdf"));

// Save the secured PDF document
pdf.saveAs(Paths.get("assets/secured.pdf"));

Edit File Security Settings

Important security options can be set easily with IronPDF in Java using the SecurityOptions class. The code below makes the PDF read-only and disallows users from copying, pasting, and printing, and sets passwords for the owner and user.

// Configure security options for the PDF document
SecurityOptions securityOptions = new SecurityOptions();
securityOptions.setAllowUserCopyPasteContent(false);
securityOptions.setAllowUserAnnotations(false);
securityOptions.setAllowUserPrinting(PdfPrintSecurity.NO_PRINT);
securityOptions.setAllowUserFormData(false);

SecurityManager securityManager = pdf.getSecurity();
// Apply the specified security options to the PDF
securityManager.setSecurityOptions(securityOptions);

// Configure security options for the PDF document
SecurityOptions securityOptions = new SecurityOptions();
securityOptions.setAllowUserCopyPasteContent(false);
securityOptions.setAllowUserAnnotations(false);
securityOptions.setAllowUserPrinting(PdfPrintSecurity.NO_PRINT);
securityOptions.setAllowUserFormData(false);

SecurityManager securityManager = pdf.getSecurity();
// Apply the specified security options to the PDF
securityManager.setSecurityOptions(securityOptions);

This will set all the necessary security options for the PDF document.

New PDF Security Settings

Summary

This article explained how to open an existing PDF document and add password protection using the IronPDF Library for Java in Java. IronPDF makes it a lot easier to work with PDF files in Java. Whether you want to create a new document or make a PDF viewer, IronPDF helps to achieve this task with a single line of code. IronPDF's Engine is well suited for the Java programming language, as it is fast and memory efficient. With IronPDF, you can set a user password along with the owner password. It provides full protection options along with other features like converting to PDF from other formats with IronPDF, splitting documents with IronPDF, and merging documents with IronPDF.

IronPDF can be used for free in a free trial of IronPDF and can be licensed for commercial use with IronPDF. Its lite package starts from $799. Download IronPDF and give it a try.