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Opensource doesn't mean "Do what you want"Wednesday, November 11. 2009Trackbacks
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If you hold the full copyright of something, you can change (or dual license) the software at any time, for new releases. The only thing you cannot do it to "un-license" the existing releases.
The question is: does Sun really hold the full copyright? If MySQL includes any code that was contributed as as part of the open source effort, it does not own the copyright of these changes and would get problems to license the software under anything other than GPL.
The copyright is shared between the contributor and Sun due to the Sun Contributor agreement. So Sun can relicense the code, but it it can not-unlicense it and it's choice of relicensing is limited: "Any contribution we make available under any license will also be made available under a suitable FSF (Free Software Foundation) or OSI (Open Source Initiative) approved license." So as long the contributions are in the code, sun has to publish them under an Opensource license. At least, that's my understanding of this legalese.
But that wouldn't be a sensible choice, as Sun has to publish contributions as open source (due to the SCA) and everybody else can walk away with the code
Changing the license to BSD is indeed some danger to competetors: MySQL would change the license of the current version (including all contributions) of MySQL to BSD, then would release a new version of MySQL that includes some changes from Sun using a non-FSF license. The BSD license allows this, and after some commits it becomes impossible to remove the non-FSF code to make the software open source again.
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