KHTML (LGPL, not GPL) taken by Apple to make WebKit (LGPL), later "rewritten" and licensed BSD for 2.0.
Apple did also the dirty trick of giving a single huge patch against the previous release of KHTML making it almost impossible to integrate back to the main codebase. Even LGPL can be abused. Lesson learned the hard way by the community.
And you now have everyone parroting how great WebKit is, nobody remembers the original team at KDE. It was brutal.
> While Microsoft uses the Kerberos protocol, it does not use the MIT software.
The license of the original implementation is thus irrelevant. Pretty much the only thing that would have prevented MS would have been if there were patents on Kerberos.
How would the Oracle lawsuit change anything? Protocols are almost explicitly the things that are not protected by copyright. The problem is, people here are confusing interfaces in human-readable code (copyright-eligible) with interfaces for binary interoperability between systems (not eligible).
1. http://www.heise.de/newsticker/meldung/Microsoft-und-Open-So... 2. http://slashdot.org/story/00/05/02/158204/kerberos-pacs-and-... 3. http://features.slashdot.org/story/00/05/18/2015251/our-atto...
At least to my knowledge the opposite seems to be more common. Experts release a library under a very permissive licence, and everybody wins. One such example is libPNG.
http://www.libpng.org/pub/png/src/libpng-LICENSE.txt