class Encrypt extends AbstractTool {

    private final static int[] PERMISSIONS = {
            PdfWriter.ALLOW_PRINTING,
            PdfWriter.ALLOW_MODIFY_CONTENTS,
            PdfWriter.ALLOW_COPY,
            PdfWriter.ALLOW_MODIFY_ANNOTATIONS,
            PdfWriter.ALLOW_FILL_IN,
            PdfWriter.ALLOW_SCREENREADERS,
            PdfWriter.ALLOW_ASSEMBLY,
            PdfWriter.ALLOW_DEGRADED_PRINTING};
    private final static String[] PERMISSION_OPTIONS = {
            "AllowPrinting",
            "AllowModifyContents",
            "AllowCopy",
            "AllowModifyAnnotations",
            "AllowFillIn (128 bit only)",
            "AllowScreenReaders (128 bit only)",
            "AllowAssembly (128 bit only)",
            "AllowDegradedPrinting (128 bit only)"
    };

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

    /**
     * Constructs an Encrypt object.
     */
    public Encrypt() {
        arguments.add(new FileArgument(this, "srcfile", "The file you want to encrypt", false, new PdfFilter()));
        arguments.add(new FileArgument(this, "destfile", "The file to which the encrypted PDF has to be written", true,
                new PdfFilter()));
        arguments.add(new StringArgument(this, "ownerpassword", "The ownerpassword you want to add to the PDF file"));
        arguments.add(new StringArgument(this, "userpassword", "The userpassword you want to add to the PDF file"));
        arguments.add(new BitsetArgument(this, "permissions", "Permissions on the file", PERMISSION_OPTIONS));
        OptionArgument oa = new OptionArgument(this, "strength", "Strength of the encryption");
        oa.addOption("40 bit encryption", "40");
        oa.addOption("128 bit encryption", "128");
        arguments.add(oa);
    }

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

    /**
     * @see com.lowagie.toolbox.AbstractTool#createFrame()
     */
    protected void createFrame() {
        internalFrame = new JInternalFrame("Encrypt", true, false, true);
        internalFrame.setSize(300, 80);
        internalFrame.setJMenuBar(getMenubar());
        System.out.println("=== Encrypt OPENED ===");
    }

    /**
     * @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");
            }
            int permissions = 0;
            String p = (String) getValue("permissions");
            if (p != null) {
                for (int k = 0; k < p.length(); ++k) {
                    permissions |= (p.charAt(k) == '0' ? 0 : PERMISSIONS[k]);
                }
            }
            byte[] userpassword = null;
            if (getValue("userpassword") != null) {
                userpassword = ((String) getValue("userpassword")).getBytes();
            }
            byte[] ownerpassword = null;
            if (getValue("ownerpassword") != null) {
                ownerpassword = ((String) getValue("ownerpassword")).getBytes();
            }
            PdfReader reader = new PdfReader(((File) getValue("srcfile")).getAbsolutePath());
            PdfEncryptor.encrypt(
                    reader,
                    new FileOutputStream((File) getValue("destfile")),
                    userpassword,
                    ownerpassword,
                    permissions,
                    "128".equals(getValue("strength"))
            );
        } 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) {<FILL_FUNCTION_BODY>}

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

}

        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
    
<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