I just created a standalone App using this code. As JDK i used 1.4.2_12.

The "TestEncrypted.pdf" is created but no user password set! :(

/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 EncryptionPdf {

    public static void main(String[] args) throws IOException,
DocumentException {

        PdfReader reader = new PdfReader("Test.pdf");
        PdfStamper stamper = new PdfStamper(reader, new
FileOutputStream("TestEncrypted.pdf"));
        byte[] upwd= "test".getBytes();
        byte[] opwd = "test2".getBytes();       
        stamper.setEncryption(upwd, opwd,
                PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128 |
PdfWriter.DO_NOT_ENCRYPT_METADATA);
        stamper.close();        

    }   
        
}/

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