That is not entirely correct, the definition of hacking you are using is much newer. In the past, hacking was a much more broad term, like those above you were stating.

A hacker is a person skilled in information technology who uses their technical knowledge to achieve a goal or overcome an obstacle, within a computerized system by non-standard means. Though the term hacker has become associated in popular culture with a security hacker – someone who utilizes their technical know-how of bugs or exploits to break into computer systems and access data which would otherwise be inaccessible to them – hacking can also be utilized by legitimate figures in legal situations.

• Wikipedia entry for Hacker

It is still common in the open source community for people to use the original meaning of hacker. The hackers you are referring to are security hackers or crackers.

I used quotes because I wasn't sure if that was the real original use. (Also because I don't pay attention to or know proper grammar rules).