Limiting freedom of expression may lead to exploitation, indoctrination, apathy, alienation and general stagnation as a result of inequality and injustice. It may serve to strengthen political dictatorship and government control or moralistic repression. Methods include censorship; the refusal of licence (where it is necessary); injunctions; damages; denial of distribution and news access; restrictive taxation, subsidies and importation laws; interference; copyright; monopoly; commercialism; scarcity of resources; curtailment by governments of access to newsprint; corruption; and public opinion. Restrictions may be exercised by the government, private firms and authorities, or by the public.