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:Japan Patent: JP322544B2 expiry date 16.05.2011
This is consistent with my read of the two patent docs with links above (I am a U.S. patent lawyer, but my OR is just as O). [[User:TJRC|TJRC]] ([[User talk:TJRC|talk]]) 23:29, 5 July 2011 (UTC)
:Some additional sources:
:;Web
:* [http://www.pgp.net/pgpnet/pgp-faq/pgp-faq-general-questions.html#patent-idea PGP FAQ]: "This patent expires 25 May 2010 (USA) or 16 May 2011 (Europe and Japan)."
:;Printed books
:*[http://books.google.com/books?id=z-3foyEoo-UC&pg=PA178&dq=IDEA+encryption+patent+expires&hl=en&ei=VqQTTo7POsnVgQej8Kj-BA&sa=X&oi=book_result&ct=result&resnum=9&ved=0CGMQ6AEwCA#v=onepage&q&f=false Data privacy and security], by David Salomon, p. 178: "Furthermore, the patent (which will expire in 2011) restricts its commercial use."
:* [http://books.google.com/books?id=42etT_9-_9MC&pg=PT262&dq=IDEA+encryption+patent+expires&hl=en&ei=VqQTTo7POsnVgQej8Kj-BA&sa=X&oi=book_result&ct=result&resnum=3&ved=0CEIQ6AEwAg#v=onepage&q=IDEA%20encryption%20patent%20expires&f=false Java I/O], by Elliotte Rusty Harold, p. 238: " The patent expires in 2010 in the US, 2011 in Europe."
;* [http://books.google.com/books?id=wzXMWf8sq80C&pg=PA232&dq=IDEA+encryption+patent+expires&hl=en&ei=VqQTTo7POsnVgQej8Kj-BA&sa=X&oi=book_result&ct=result&resnum=8&ved=0CF4Q6AEwBw#v=onepage&q&f=false Cryptology unlocked], by Reinhard Wobst, p. 232: "Unfortunately, it is less noticed that IDEA is patent-protected—in Europe until May 16, 2011, while the USA will enjoy its free use one year earlier." See also the table 5.1 on page 233, which lists the various IDEA patents and their expiration. Note that at the time of the books 1996 publication, the Japanese patent had not yet been issued.
;* [http://books.google.com/books?id=9gCn86CmsNQC&pg=PA349&dq=IDEA+encryption+patent+expires&hl=en&ei=9aQTTtmeN8nEgQe6uKn-BA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCgQ6AEwADge#v=onepage&q&f=false Official (ISC)2 Guide to the CISSP CBK, Second Edition], by Harold F. Tipton, p. 349: "The patents on IDEA will expire in 2010–2011, but it is available for free for noncommercial use."
:Non-RS web sites, such as forums and blogs, are mixed, with many referring to a 2012 expiration, but I suspect they get their info from this article. [http://crypto.junod.info/2011/05/ One site] is express about that: "the European patent protecting the IDEA (International Data Encryption Algorithm) block cipher has expired a few days ago, on May 16th, 2011, and hence felt into the public ___domain. Note however that, according to its Wikipedia page, the cipher is still protected in the US until January 7th, 2012." [[User:TJRC|TJRC]] ([[User talk:TJRC|talk]]) 00:05, 6 July 2011 (UTC)
== TODO list (now done!) ==
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