Freedom of speech is the political right to communicate one's opinions and ideas using one's body and property to anyone who is willing to receive them. The term freedom of expression is sometimes used synonymously, but includes any act of seeking, receiving and imparting information or ideas, regardless of the medium used. Every government restricts speech to some degree. Common limitations on speech relate to: libel, slander, obscenity, pornography, sedition, hate speech, incitement, fighting words, classified information, copyright violation, trade secrets, non-disclosure agreements, right to privacy, right to be forgotten, public security, public order, public nuisance, and campaign finance reform. Whether these limitations can be justified under the harm principle depends upon whether influencing a third party's opinions or actions adversely to the second party constitutes such harm or not. The term "offense principle" is also used to expand the range of free speech limitations to prohibit forms of expression where they are considered offensive to society, special interest groups or individuals.