Works in the public domain are those whose intellectual property rights have expired, have been forfeited, or are inapplicable

Copyright is a legal right created by the law of a country, that grants the creator of an original work exclusive rights  to its use and distribution, usually for a limited time, with the intention of enabling the creator (e.g. the photographer of a photograph or the author of a book) to receive compensation for their intellectual effort.

Fair use is a limitation to the exception to the exclusive right  granted by copyright law to the author of a creative work

an example of fair use is the example of unlimited internet bundles by internet service providers, after a certain level of data usage they offer to you the service at a reduced speed rather than terminating the connection as the agreement calls for an unlimited use.

copyright can be violated by counterfeiting of goods or stealing of intellectual property and using for owns benefit.

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