itext setEncryption报错问题

我只想对生成的pdf 设置不能复制 
源代码1 ： 
 private final static String READFILEPATH = "C:\\Users\\libin\\Desktop\\test_converto_PDF\\910.prt"; //txt文件
 private final static String WRITEFILEPATH = "C:\\Users\\libin\\Desktop\\test_converto_PDF\\910.PDF"; //生成的pdf文件
 
 @SuppressWarnings("deprecation")
public static void main(String[] args) throws DocumentException,      
             IOException {      
         Document document = new Document(PageSize.A4, 80, 80, 60, 30);      
         PdfWriter pdfWriter =  PdfWriter.getInstance(document, new FileOutputStream(WRITEFILEPATH));    
         pdfWriter.setEncryption(null,null, PdfWriter.AllowFillIn, false);
         document.open();      
         BaseFont bfChinese = BaseFont.createFont("STSong-Light",      
                 "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);      
         Font FontChinese = new Font(bfChinese, 18, Font.NORMAL);      
         Paragraph t = new Paragraph("oracle手册", FontChinese); //起一个别名，上班老板都不会发现，呵呵。      
         t.setAlignment(Element.ALIGN_CENTER);      
         t.setLeading(30.0f);      
         document.add(t);      
         FontChinese = new Font(bfChinese, 11, Font.NORMAL);      
         BufferedReader read = null;      
         try {      
             read = new BufferedReader(new FileReader(READFILEPATH));      
             String line = null;      
             while ((line = read.readLine()) != null) {      
                 t = new Paragraph(line, FontChinese);      
                 t.setAlignment(Element.ALIGN_LEFT);      
                 t.setLeading(20.0f);      
                 document.add(t);      
             }      
         } catch (Exception e) {      
             System.out.println("目标文件不存，或者不可读！");      
             e.printStackTrace();      
         } finally {      
             try {      
                 read.close();      
                 document.close();      
             } catch (IOException e) {      
                 e.printStackTrace();      
             }      
         }      
         System.out.println("============执行成功！===========");      
     }      

源代码2 ：
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

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

public class PDFConvert2 {

private final static String READFILEPATH = "C:\\Users\\libin\\Desktop\\test_converto_PDF\\910.PDF"; //txt文件
private final static String WRITEFILEPATH = "C:\\Users\\libin\\Desktop\\test_converto_PDF\\910(2).PDF"; //生成的pdf文件

public static void main(String[] args) {
try {
PdfReader reader = new PdfReader(READFILEPATH);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream( WRITEFILEPATH));
stamper.setEncryption(null,null, PdfWriter.AllowFillIn, false);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
} catch (IOException e) {
e.printStackTrace();
}  
 
}
}


出现这个问题
Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/asn1/ASN1OctetString
at com.lowagie.text.pdf.PdfEncryption.<init>(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.setEncryption(Unknown Source)
at com.lowagie.text.pdf.PdfStamper.setEncryption(Unknown Source)
at com.ncs.test.PDFConvert2.main(PDFConvert2.java:21)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.ASN1OctetString
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 4 more
后来网上说添加这两个jar包bcpkix-jdk15on-1.48.jar，bcprov-jdk15on-147.jar
我加了以后  又报这种错误 
Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/asn1/DEREncodable
at com.lowagie.text.pdf.PdfEncryption.<init>(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.setEncryption(Unknown Source)
at com.lowagie.text.pdf.PdfStamper.setEncryption(Unknown Source)
at com.ncs.test.PDFConvert2.main(PDFConvert2.java:21)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.DEREncodable
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 4 more


求各位大神解答