Works are in the public domain if they are not covered by intellectual property rights at all, if the intellectual property rights have expired, and/or if the intellectual property rights are forfeited. Examples include the English language, the formulae of Newtonian physics, as well as the works of Shakespeare and the patents over powered flight.
Public domain is a concept of intellectual property law, which includes copyright, patents and trademarks, and refers to works, ideas, and information which are intangible to private ownership and/or which are available for use by members of the public.
The Daily Omnivore 
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