Encrypt the file with PdfStamper

import java.io.FileOutputStream;

import com.lowagie.text.pdf.PdfEncryptor;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfWriter;

public class MainClass {

public static void main(String[] args) throws Exception {
PdfReader reader = new PdfReader("1.pdf");
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("Encrypted1.pdf"));
stamper.setEncryption("Hello".getBytes(), "World".getBytes(), PdfWriter.AllowPrinting
| PdfWriter.AllowCopy, PdfWriter.STRENGTH40BITS);
stamper.close();

getEncryptionInformation("1.pdf", null);
getEncryptionInformation("Encrypted1.pdf", "World");
}

public static void getEncryptionInformation(String filename, String ownerpassword)
throws Exception {
PdfReader reader;
if (ownerpassword == null)
reader = new PdfReader(filename);
else
reader = new PdfReader(filename, ownerpassword.getBytes());
System.out.println("Encrypted? " + reader.isEncrypted());
if (reader.isEncrypted()) {
System.out.println("Permissions: "
+ PdfEncryptor.getPermissionsVerbose(reader.getPermissions()));
System.out.println("128 bit? " + reader.is128Key());
}
}

}

Tagged in:

• Encrypt
• pdf
• File
• java