Khóa hoặc bảo vệ PPT bằng mật khẩu với Java

Presentation presentation = new Presentation("presentation.ppt");
try {
    presentation.getProtectionManager().encrypt("123123");
    presentation.save("encrypted-presentation.ppt", SaveFormat.Ppt);
} finally {
    presentation.dispose();
}

Presentation presentation = new Presentation("presentation.ppt");
try {
    presentation.getProtectionManager().setWriteProtection("123123");
    presentation.save("write-protected-presentation.ppt", SaveFormat.Ppt);
} finally {
    presentation.dispose();
}