Java tutorial
import java.io.FileOutputStream; import java.io.IOException; import com.lowagie.text.Document; import com.lowagie.text.DocumentException; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfWriter; public class EncryptedPDFWithUserPasswordOwnerPassword { public static void main(String[] args) { Document document = new Document(); try { PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("EncryptedPDFWithUserPasswordOwnerPassword.pdf")); //setEncryption(boolean strength, String userPassword, String ownerPassword, int permissions) writer.setEncryption(PdfWriter.STRENGTH128BITS, "java2s.com", "World", PdfWriter.AllowCopy | PdfWriter.AllowPrinting); document.open(); document.add(new Paragraph("Hello World")); } catch (DocumentException de) { System.err.println(de.getMessage()); } catch (IOException ioe) { System.err.println(ioe.getMessage()); } document.close(); } }