See also: Taxonomy
Classification is the process of describing a set of similar objects in logical categories for analysis, education and other purposes. Although some classification systems are really censorship systems in disguise however the Internet and other means create access to much material which otherwise has a "restricted access" rating by law.
For security reasons, governments often classify some types of sensitive information as secret and restrict access to certain trusted individuals. Some explicit intellectual property such as pornography is classified offensive and consequently has resulted in government censorship of this kind of material in many jurisdictions.
- Classification Society of North America (CSNA)
- International Federation of Classification Societies (IFCS)