He mahi, he pūmanawa rānei kia kore ai e tomokia tētahi kōnae, tētahi papatono, tētahi rorohiko rānei e te tangata kāore i a ia te mana.
A practice or a piece of software which prevents a file, a programme or a computer from being accessed by someone who does not have the authority to do so.
mau - made fast, held
kati - to stop, halt, obstruct
raka (kupu mino)