In fact in my country we have a "Section 252" of the crimes act that makes it illegal to access any computer system without authorisation - which would cover all former employees.  Up to a 2 year jail term for that.  And if you actually cause damage the term can start going up with other charges.   http://www.legislation.govt.nz/act/public/2003/0039/latest/whole.html#DLM200273   ... View more