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Works in the public domain are those whose intellectual property rights have expired, have been forfeited, or are inapplicable. For example, the works of Shakespeare and Beethoven, most of the early silent films, the formulae of Newtonian physics, the Serpent encryption algorithm and powered flight are all now in the public domain.〔 The term is not normally applied to situations where the creator of a work retains residual rights, in which case use of the work is referred to as "under license" or "with permission". As rights are country-based and vary, a work may be subject to rights in one country and be in the public domain in another. Some rights depend on registrations on a country-by-country basis, and the absence of registration in a particular country, if required, creates public domain status for a work in that country. ==History== Although the term "public domain" did not come into use until the mid-18th century, the concept "can be traced back to the ancient Roman Law, as a preset system included in the property right system." The Romans had a large proprietary rights system where they defined "many things that cannot be privately owned"〔 as ''res nullius'', ''res communes'', ''res publicae'' and ''res universitatis''. The term ''res nullius'' was defined as things not yet appropriated.〔Rose, C Romans, Roads, and Romantic Creators: Traditions of Public Property in the Information Age (Winter 2003) Law and Contemporary Problems 89 at p.5, p.4〕 The term ''res commune'' was defined as "things that could be commonly enjoyed by mankind, such as air, sunlight and ocean."〔 The term ''res publicae'' referred to things that were shared by all citizens, and the term ''res universitatis'' meant things that were owned by the municipalities of Rome.〔 When looking at the public domain from a historical perspective, one could say the construction of the idea of "public domain" sprouted from the concepts of ''res commune'', ''res publicae'', and ''res universitatis'' in early Roman Law.〔 When the first early copyright law was first established in Britain with the Statute of Anne in 1710, public domain did not appear. However, similar concepts were developed by British and French jurists in the eighteenth century. Instead of "public domain" they used terms such as ''publici juris'' or ''propriété publique'' to describe works that were not covered by copyright law. The phrase "fall in the public domain" can be traced to mid-nineteenth century France to describe the end of copyright term. The French poet Alfred de Vigny equated the expiration of copyright with a work falling "into the sink hole of the public domain" and if the public domain receives any attention from intellectual property lawyers it is still treated as little more than that which is left when intellectual property rights, such as copyright, patents, and trademarks, expire or are abandoned. In this historical context Paul Torremans describes copyright as a "little coral reef of private right jutting up from the ocean of the public domain." Because copyright law is different from country to country, Pamela Samuelson has described the public domain as being "different sizes at different times in different countries". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「public domain」の詳細全文を読む スポンサード リンク
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