Data Delete 

Securely deleting files is not quite as easy as it appears at first. The operating system does not really remove the data; references to the content are simply removed and it is easy to reconstruct this data using the appropriate program. ArchiCrypt......

When a fire is put out, it is very important to make sure that the fire is completely out. Embers left behind can flare up and the damage can begin anew. When you put out a fire, you want the fire totally extinguished.

This is the same idea behind......

 Data Delete