Hack and hacktivism had been a negative word for many years, but similar to the word 'geek', there are some positive meanings in recent years.
Hacker usually refers to person who with a high degree of understanding of computer science, and programming. In the field of information security, "hacker" means to study how to crack the computer security system. They use public communication networks, such as telephone systems and the Internet, to log on to the system in informal situations and get the authority to control the system. Things became different now, hackers usually not getting profits illegally like crackers. Hackers built things, not crack things. Hack now refers to those who have a great interest in new technologies and create with new technologies.
Because computer science is a lot of manpower and decades of development, hack to do things are built on the basis of predecessors, in the artistic creation point of view, there are a lot of appropriation. This is also a feature of the new media art.