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(詳細はcopyright protection for a work can be extended for a second term. Once the term of copyright protection has ended, the copyrighted work enters the public domain, and can be freely reproduced and incorporated into new works. In the United States, works published before 1923 are all in the public domain under the provisions of the Copyright Act of 1909 and previous law. This act provided for an initial term of 28 years. This term could be extended for an additional 28 years by registering copyright renewal with the US copyright office.〔 Works published before 1964 in the US are all in the public domain, excepting only those for which a renewal was registered with the US copyright office.〔〔(【引用サイトリンク】title=Copyright renewal: when it had to happen, or else )〕 Relatively few works from this era have had their copyrights renewed. A US copyright office study in 1961 found that less than 15% of registered copyrights had been renewed. While the copyrights for most movies were renewed, one important example of a film that entered the public domain because of non-renewal is ''It's a Wonderful Life'', which was originally copyrighted in 1946 and entered the public domain in 1975.〔 No online access.〕 The US Copyright Act of 1976 modified these provisions so that the second, renewed term was 47 years. This extension applied to works that had been copyrighted between 1950 and 1977 and were thus in their first 28-year term of copyright protection, as well as to new works copyrighted after 1977.〔(【引用サイトリンク】title=Circular 15: Renewal of Copyright )〕 The maximum term of copyright protection became 75 years instead of the 56 years of the 1909 law, and applied to works whose copyrights were renewed in 1978 or later. Copyright renewal has largely lost its significance for works copyrighted in the US in 1964 or after due to the Copyright Renewal Act of 1992. This law removed the requirement that a second term of copyright protection is contingent on a renewal registration. The effect was that any work copyrighted in the US in 1964 or after had a copyright term of 75 years, whether or not a formal copyright renewal was filed. There are some legal reasons for filing such renewal registrations. A further amendment to US copyright law in 1998 extended the total term of protection to 95 years, which now applies to all works copyrighted in 1964 or after.〔 ==Determining whether a US copyright was renewed== Copyright renewal is significant for works with US copyright notices from 1923–1963. All copyright registrations and renewal registrations are published by the Copyright Office in its ''Catalog of Copyright Entries''. For works with copyright notices from 1950 onward, the catalog can be searched online for renewals using a website maintained by the Copyright Office; the corresponding renewals are from 1978–1991.〔〔(【引用サイトリンク】url=http://cocatalog.loc.gov/cgi-bin/Pwebrecon.cgi?DB=local&PAGE=First ) Online database for all copyrights registered or renewed in 1978 or after. For works with copyrights from 1950 or after, the renewal will appear here.〕 For copyrights from 1923–1949 (renewals from 1951–1977), online searches can be done for book copyrights using a database maintained by Stanford University.〔(【引用サイトリンク】url=http://collections.stanford.edu/copyrightrenewals/bin/page?forward=home )〕 Many volumes of the ''Catalog of Copyright Entries'' have been digitized and can be accessed through the Internet Archive.〔(【引用サイトリンク】work=Internet Archive )〕 Copies of the ''Catalog of Copyright Entries'' are available at the Copyright Office itself (in Washington, D.C., and at some libraries. For listings of renewals and non-renewals of periodicals and newspapers after 1923, see the complete report prepared by the University of Pennsylvania Library. 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「Copyright renewal」の詳細全文を読む スポンサード リンク
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