The GNU General Public License (GPL) and the OpenSolaris operative system have something in common. They are going right now through big changes process.  Smaller, but not less important, the one for the OpenSolaris, bigger and with, i believe, strong consequences for the GPL.

Sun Microsystem, who initially started Solaris (proprietary os), and then released it as a Free Software project with the name of OpenSolaris and under the terms of the Common Development and . . . → Read More: No GPLv3 for OpenSolaris, not for now