Perpetual copyright
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Perpetual copyright refers to a copyright which does not expire. In general, copyright on all works not having special legislation in their favour expires after a certain number of years, usually dependent on the author's date of death.
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Perpetual copyright around the world
"Common law" copyright
Common law once had a doctrine of copyright where unpublished works were restricted by their authors indefinitely. This has been repudiated in the United States and Britain, where the courts have ruled that copyright is a purely legislative state.
Portugal
Portugal amended the Copyright Act in 1927, from its previous 50 years modified Copyright term to "perpetual". However, this stipulation was withdrawn in 1966.
United Kingdom
In the United Kingdom, a small number of works are subject to a copyright-like perpetual licensing regime. The regime is governed by letters patent issued under the royal prerogative. It is a common misconception that these works are perpetually under copyright. The works covered include those particularly associated with the Church of England, and by extension the British crown, including the Book of Common Prayer and the King James Version of the Bible. Only certain organisations are licensed to reproduce these works in the UK. Since these are not copyright restrictions, they are not recognized outside the UK, even under the separate royal prerogatives of other Commonwealth realms.
J. M. Barrie's play Peter Pan is covered by special legislation establishing that Great Ormond Street Hospital may collect royalties in perpetuity. However, this is not an actual perpetual copyright because the hospital does not retain creative control over the work. It is also not recognized outside the UK.
United States
In the United States, perpetual copyright is prohibited by the US Constitution, which provides that copyright must be "for limited times". However, it does not specify how long that term can be, and it has successively been extended by Congress, retroactively extending the terms of any copyrights still in force. Some have argued that two consecutive extensions of the copyright term in the 1970s and 1990s have created a de facto "perpetual copyright on the installment plan", but this argument has been rejected by the US Supreme Court in Eldred v. Ashcroft, which held that the term of copyright may be extended by Congress, so long as it is still a limited term at the time of each extension.
Singapore
Pursuant to Section 197 of the Copyright Act, unpublished governmental literary, dramatic and musical works are under perpetual copyright, but once published, they are copyrighted for 70 years since their publications as Singapore does not grant perpetual copyright to published works.ja:永久著作権
