System software (or systems software) is computer software designed to operate and control the computer hardware and to provide a platform for running application software.
System software includes the following:
Copy protection, also known as content protection, copy obstruction, copy prevention and copy restriction, is any effort designed to prevent the reproduction of software, films, music, and other media, usually for copyright reasons. Various methods have been devised to prevent reproduction so that companies will gain benefit from each users who obtain a copy of their product. Unauthorized copying and distribution accounted for $2.4 billion in United States in 1990s, and is assumed to be causing impact on revenues in music or game industry, leading to proposal of anti-piracy laws such as PIPA. Some methods of copy protection have also led to criticisms because it caused inconvenience for honest users or secretly installed additional software to watch activity on user's computer to detect copying. Effective copy protection as well as protecting user rights is still an ongoing problem with media publication.
Copyright infringement is the use of works under copyright, infringing the copyright holder's exclusive rights, such as the right to reproduce, distribute, display or perform the copyrighted work, or to make derivative works, without permission from the copyright holder, which is typically a publisher or other business representing or assigned by the work's creator.
Traitor tracing is a copyright infringement detection system which works by tracing the source of leaked files rather than by direct copy protection. The method is that the distributor adds a unique salt to each copy given out. When a copy of it is leaked to the public, the distributor can check the value on it and trace it back to the "leaker".