class Decrypt extends AbstractTool {

    static {
        addVersion("$Id: Decrypt.java 3271 2008-04-18 20:39:42Z xlv $");
    }


    /**
     * Constructs a Decrypt object.
     */
    public Decrypt() {
        arguments.add(new FileArgument(this, "srcfile", "The file you want to decrypt", false, new PdfFilter()));
        arguments.add(new FileArgument(this, "destfile", "The file to which the decrypted PDF has to be written", true,
                new PdfFilter()));
        arguments.add(new StringArgument(this, "ownerpassword", "The ownerpassword you want to add to the PDF file"));
    }

    /**
     * Decrypts an existing PDF file.
     *
     * @param args String[]
     */
    public static void main(String[] args) {
        Decrypt tool = new Decrypt();
        if (args.length < 2) {
            System.err.println(tool.getUsage());
        }
        tool.setMainArguments(args);
        tool.execute();
    }

    /**
     * @see com.lowagie.toolbox.AbstractTool#createFrame()
     */
    protected void createFrame() {<FILL_FUNCTION_BODY>}

    /**
     * @see com.lowagie.toolbox.AbstractTool#execute()
     */
    public void execute() {
        try {
            if (getValue("srcfile") == null) {
                throw new InstantiationException("You need to choose a sourcefile");
            }
            if (getValue("destfile") == null) {
                throw new InstantiationException("You need to choose a destination file");
            }
            byte[] ownerpassword = null;
            if (getValue("ownerpassword") != null) {
                ownerpassword = ((String) getValue("ownerpassword")).getBytes();
            }
            PdfReader reader = new PdfReader(((File) getValue("srcfile")).getAbsolutePath(), ownerpassword);
            PdfStamper stamper = new PdfStamper(reader, new FileOutputStream((File) getValue("destfile")));
            stamper.close();
        } catch (Exception e) {
            JOptionPane.showMessageDialog(internalFrame,
                    e.getMessage(),
                    e.getClass().getName(),
                    JOptionPane.ERROR_MESSAGE);
            System.err.println(e.getMessage());
        }
    }

    /**
     * @param arg StringArgument
     * @see com.lowagie.toolbox.AbstractTool#valueHasChanged(com.lowagie.toolbox.arguments.AbstractArgument)
     */
    public void valueHasChanged(AbstractArgument arg) {
        if (internalFrame == null) {
            // if the internal frame is null, the tool was called from the command line
            return;
        }
        // represent the changes of the argument in the internal frame
    }

    /**
     * @return File
     * @throws InstantiationException on error
     * @see com.lowagie.toolbox.AbstractTool#getDestPathPDF()
     */
    protected File getDestPathPDF() throws InstantiationException {
        return (File) getValue("destfile");
    }

}

        internalFrame = new JInternalFrame("Decrypt", true, false, true);
        internalFrame.setSize(300, 80);
        internalFrame.setJMenuBar(getMenubar());
        System.out.println("=== Decrypt OPENED ===");
    
<methods>public void <init>() ,public void actionPerformed(java.awt.event.ActionEvent) ,public abstract void execute() ,public ArrayList<com.lowagie.toolbox.arguments.AbstractArgument> getArguments() ,public javax.swing.JInternalFrame getInternalFrame() ,public javax.swing.JMenuBar getMenubar() ,public java.lang.String getUsage() ,public java.lang.Object getValue(java.lang.String) throws java.lang.InstantiationException,public void setArguments(ArrayList<com.lowagie.toolbox.arguments.AbstractArgument>) ,public void setInternalFrame(javax.swing.JInternalFrame) ,public void setMainArguments(java.lang.String[]) ,public void setMenubar(javax.swing.JMenuBar) ,public abstract void valueHasChanged(com.lowagie.toolbox.arguments.AbstractArgument) <variables>public static final int MENU_EXECUTE,public static final int MENU_EXECUTE_PRINT,public static final int MENU_EXECUTE_PRINT_SILENT,public static final int MENU_EXECUTE_SHOW,protected ArrayList<com.lowagie.toolbox.arguments.AbstractArgument> arguments,private java.awt.Desktop awtdesktop,protected javax.swing.JInternalFrame internalFrame,private javax.swing.JMenuBar menubar,protected int menuoptions,public static ArrayList<java.lang.String> versionsarray