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== Open source license ==
In June 2013, [[Oracle Corporation|Oracle]] changed the license of [[Berkeley DB]] (a related project) from the [[Sleepycat license]] to the [[Affero General Public License]],<ref>{{cite web | url=https://oss.oracle.com/pipermail/bdb/2013-June/000056.html|title=Berkeley DB Release Announcement|publisher=[[Oracle Corporation]] |quote=Starting with the 6.0 / 12c releases, all Berkeley DB products are licensed under the GNU AFFERO GENERAL PUBLIC LICENSE (AGPL), version 3. This license is published by the Free Software Foundation (FSF) (1) and approved by the Open Source Initiative (2). Please review the terms of the license to ensure compliance before upgrading to the 12c release. Previous releases of Berkeley DB software will continue to be distributed under the Sleepycat license.}}</ref> thus restricting its use in a wide variety of applications. This caused the [[Debian|Debian project]] to exclude the library from 6.0 onwards. It was also criticized that this license is not friendly to commercial redistributors. The discussion was sparked over whether the same licensing change could happen to LMDB. Author Howard Chu made clear that LMDB is part of the OpenLDAP project, which had its BSD style license before he joined, and it will stay like it. No copyright is transferred to anybody by checking in, which would make a similar move like Oracle's impossible.<ref>{{cite mailing list | url=http://lists.debian.org/debian-devel/2013/07/msg00031.html |title=Berkeley DB 6.0 license change to AGPLv3 |date=July 2, 2013 |mailing-list=debian-devel |publisher=[[Debian]] |author=Ondřej Surý}}</ref><ref>{{cite news |url=http://www.infoworld.com/d/open-source-software/oracle-switches-berkeley-db-license-222097 |title=Oracle switches Berkeley DB license |author=Simon Phipps |date=July 5, 2013 |publisher=[[InfoWorld]]}}</ref><ref>{{cite web | url=http://developers.slashdot.org/story/13/07/05/1647215/oracle-quietly-switches-berkeleydb-to-agpl|title=Oracle Quietly Switches BerkeleyDB to AGPL|publisher=[[Slashdot]]}}</ref><ref>{{cite web |url=http://programmers-in-ua.blogspot.com/2013/07/oracle-berkeley-db.html |title=Oracle меняет лицензию Berkeley DB |publisher=[[Blogspot]] |website=Programmers in Ukraine |date=July 22, 2013 |language=ru |trans-title=Oracle Berkeley DB license changes}}</ref><ref>{{cite web | url=http://www.lemondeinformatique.fr/actualites/lire-oracle-passe-berkeley-db-sous-licence-gnu-agpl-54287.html|title=Oracle passe Berkeley DB sous licence GNU AGPL |language=fr |trans-title=Oracle Berkeley DB passes under GNU AGPL |date=July 8, 2013 |author= Jean Elyan |publisher=Le Monde Informatique}}</ref><ref>{{cite web | url=http://www.abclinuxu.cz/zpravicky/berkeley-db-6.0-vydana-pod-licenci-agplv3 |title=Berkeley DB 6.0 vydána pod licencí AGPLv3 |language=cs |trans-title=Berkeley DB 6.0 is released under the GPLv3 license |date=July 2, 2013 |author=Ondřej Surý |publisher=Abclinuxu}}</ref><ref>{{cite web | url=https://lwn.net/Articles/557820/ |title=Debian, Berkeley DB, and AGPLv3 |author=Nathan Willis |date=July 10, 2013 |publisher=[[LWN.net]]}}</ref><!-- Nathan Willis copied several posts from debian-devel to LWN.net, including url=https://lwn.net/Articles/558155/ and url=https://lwn.net/Articles/558154/; let's cite the original--><ref>{{cite mailing list | url=https://lists.debian.org/debian-devel/2013/07/msg00047.html |title=Berkeley DB 6.0 license change to AGPLv3 |date=July 2, 2013 |mailing-list=debian-devel |publisher=[[Debian]] |author=Dan Shearer}}</ref><ref>{{cite mailing list | url=https://lists.debian.org/debian-devel/2013/07/msg00067.html |title=Berkeley DB 6.0 license change to AGPLv3 |date=July 2, 2013 |mailing-list=debian-devel |publisher=[[Debian]] |author=Howard Chu}}</ref>
The Berkeley DB license issue has caused major GNU/Linux distributions such as [[Debian]] to completely phase out their use of Berkeley DB, with a preference for LMDB.<ref>{{cite mailing list | url=https://lists.debian.org/debian-devel/2014/06/msg00338.html | title=New project goal: Get rid of Berkeley DB (post jessie) | mailing-list=debian-devel | date=June 19, 2014 | author=Ondřej Surý |publisher=[[Debian]]}}</ref>
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