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Forks often restart version numbering from 0.1 or 1.0 even if the original software was at version 3.0, 4.0, or 5.0. An exception is when the forked software is designed to be a drop-in replacement for the original project, ''e.g.'' [[MariaDB]] for [[MySQL]]<ref>[http://programmers.stackexchange.com/questions/31551/forked-a-project-where-do-my-version-numbers-start Forked a project, where do my version numbers start?] {{webarchive|url=https://web.archive.org/web/20110826152252/http://programmers.stackexchange.com/questions/31551/forked-a-project-where-do-my-version-numbers-start |date=26 August 2011 }}</ref> or [[LibreOffice]] for [[OpenOffice.org]].
The [[BSD licenses]] permit forks to become proprietary software, and [[copyleft]] proponents say that commercial incentives thus make proprietisation almost inevitable. (Copyleft licenses can, however, be circumvented via dual-licensing with a proprietary grant in the form of a [[Contributor License Agreement]].) Examples include [[macOS]] (based on the proprietary [[NeXTSTEP]] and the open source [[FreeBSD]]), [[Cedega (software)|Cedega]] and [[CrossOver]] (proprietary forks of [[Wine (software)|Wine]], though CrossOver tracks Wine and contributes considerably), EnterpriseDB (a fork of [[PostgreSQL]], adding Oracle compatibility features<ref>[http://www.enterprisedb.com EnterpriseDB] {{webarchive|url=https://web.archive.org/web/20061113052033/http://www.enterprisedb.com/ |date=13 November 2006 }}</ref>), Supported PostgreSQL with their proprietary ESM storage system,<ref>[http://www.fastware.com.au/docs/FujitsuSupportedPostreSQLWhitePaperV1_02.pdf Fujitsu Supported PostgreSQL] {{webarchive|url=https://web.archive.org/web/20060820144738/http://fastware.com.au/docs/FujitsuSupportedPostreSQLWhitePaperV1_02.pdf |date=20 August 2006 }}</ref> and Netezza's<ref>[http://www.netezza.com/media/2004/Weblog.htm Netezza] {{webarchive|url=https://web.archive.org/web/20061113210650/http://www.netezza.com/media/2004/Weblog.htm |date=13 November 2006 }}</ref> proprietary highly scalable derivative of PostgreSQL. Some of these vendors contribute back changes to the community project, while some keep their changes as their own competitive advantages.▼
==Forking proprietary software==
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A notable proprietary fork not of this kind is the many varieties of proprietary [[Unix]]—almost all derived from AT&T Unix under license and all called "Unix", but increasingly mutually incompatible.<ref name=moen>[http://linuxmafia.com/faq/Licensing_and_Law/forking.html Fear of forking] {{webarchive|url=https://web.archive.org/web/20121217044712/http://linuxmafia.com/faq/Licensing_and_Law/forking.html |date=17 December 2012 }} - An essay about forking in [[free software]] projects, by Rick Moen</ref> ''See'' [[UNIX wars]].
▲The [[BSD licenses]] permit forks to become proprietary software, and [[copyleft]] proponents say that commercial incentives thus make proprietisation almost inevitable. (Copyleft licenses can, however, be circumvented via dual-licensing with a proprietary grant in the form of a [[Contributor License Agreement]].) Examples include [[macOS]] (based on the proprietary [[NeXTSTEP]] and the open source [[FreeBSD]]), [[Cedega (software)|Cedega]] and [[CrossOver]] (proprietary forks of [[Wine (software)|Wine]], though CrossOver tracks Wine and contributes considerably), EnterpriseDB (a fork of [[PostgreSQL]], adding Oracle compatibility features<ref>[http://www.enterprisedb.com EnterpriseDB] {{webarchive|url=https://web.archive.org/web/20061113052033/http://www.enterprisedb.com/ |date=13 November 2006 }}</ref>), Supported PostgreSQL with their proprietary ESM storage system,<ref>[http://www.fastware.com.au/docs/FujitsuSupportedPostreSQLWhitePaperV1_02.pdf Fujitsu Supported PostgreSQL] {{webarchive|url=https://web.archive.org/web/20060820144738/http://fastware.com.au/docs/FujitsuSupportedPostreSQLWhitePaperV1_02.pdf |date=20 August 2006 }}</ref> and Netezza's<ref>[http://www.netezza.com/media/2004/Weblog.htm Netezza] {{webarchive|url=https://web.archive.org/web/20061113210650/http://www.netezza.com/media/2004/Weblog.htm |date=13 November 2006 }}</ref> proprietary highly scalable derivative of PostgreSQL. Some of these vendors contribute back changes to the community project, while some keep their changes as their own competitive advantages.
==See also==
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