how secure is my password
Dear friends
recently my friend ask to setup a macbook air 10.8.5
his ungle gave as gift
so i need to passthrough the old password to make a new password and apple id
i search on the internet and found a very easy way to reset password through recovery mode
i ask my self is there any kind way to lock the root i mean the boot
coz if i can not do then its very easy to delete password
Any help please
MacBook Pro, OS X Mavericks (10.9), SSD vector , 10gb ram