Blokowanie lub ochrona hasłem pliku PPTX za pomocą Javy

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

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