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Freedom of expression is part of the human rights of persons is protected by the Universal Declaration of 1948 and the constitutions of all democratic systems.
This freedom assumes that all individuals have the right to express themselves without being hassled because of their opinions. Freedom of expression is the freedom to do research, information and disseminate it without restrictions of borders and through any means of expression.
The expression should never be the subject of prior censorship, but rather further liability. In other words, with freedom of expression, cannot prevent the person to express themselves. On the other hand, it could be punished because of its expression. For example: a journalist plans to denounce an official of corruption during a TV program. This same official tries to hold the broadcast of the program, but the journalist, based on freedom of expression, manages to stream content. However, Justice certify that the information is false and the journalist must ultimately compensate the victim of slander and harm to the reputation or honour.
That said, the right to freedom of expression is not absolute. The law prohibits any propaganda for war, advocacy of hatred, and the incitement to violence or crime. In the countries that defend freedom of expression, cannot not promote racial discrimination or supporting the murders.
Freedom of expression is related to the freedom of the press, which is the guarantee of disseminating information through the means of social communication without prior checking of the powers of the State.