Desbloquear un PPT con Java

LoadOptions loadOptions = new LoadOptions();
loadOptions.setPassword("123123");

Presentation presentation = new Presentation("presentation.ppt", loadOptions);
try {
    presentation.getProtectionManager().removeEncryption();
    presentation.save("encryption-removed.ppt", SaveFormat.Ppt);
} finally {
    presentation.dispose();
}

Presentation presentation = new Presentation("presentation.ppt");
try {
    presentation.getProtectionManager().removeWriteProtection();
    presentation.save("write-protection-removed.ppt", SaveFormat.Ppt);
} finally {
    presentation.dispose();
}