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The privacy of correspondence is guaranteed by the constitutions of Mexico, Colombia, Brazil and Venezuela, and is alluded to in the European Convention on Human Rights[3] and the Universal Declaration of Human Rights.[2] The control of the contents inside private citizens' mail is censorship and concerns social, political, and legal aspects of civil rights. International mail and packages are subject to customs control, with the mail and packages often surveyed and their contents sometimes edited out (or even in).[citation needed]