Pretty much every free software license is irrevocable - if you make software available under that license, you can't retroactively remove those licensing terms

Pretty much every free software license is irrevocable - if you make software available under that license, you can't retroactively remove those licensing terms later. This applies whether the copyright is owned by a person or corporation. It's a fundamental building block of the concept of free software - that once software becomes free, it cannot be made non-free again. I'm not a lawyer and I'm not sure whether this has been tested in court, so I'd suggest further research on your own. There's some discussiof this on Groklaw - http://www.groklaw.net/article.php?story=2006062204552163 http://www.groklaw.net/article.php?story=2006062204552163