yawiki.org entry for Open-sourcing

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Open-sourcing is the act of releasing previously proprietary software under an open source/free software license.

Notable software packages which have been open sourced include:

Netscape Navigator, the code of which became the basis of the Mozilla and Mozilla Firefox web browsers

StarOffice, which became the base of the OpenOffice.org office suite

Global File System, was originally GPL'd, then made proprietary in 2001(?), but in 2004 was re-GPL'd.

SAP DB, which has become MaxDB, and is now distributed (and owned) by MySQL AB

InterBase database, which was open sourced by Borland in 2000 and presently exists as a commercial product and an open-source fork (Firebird)

Before changing the license of software, distributors usually audit the source code for third party licensed code which they would have to remove or obtain permission for its relicense. Backdoors and other malware should also be removed as they may easily be discovered after release of the code.

Open-sourcing

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