Sun licenses JAVA under the Gpl...

"Rich Green, Sun's executive vice president of software, said the company hopes to turn more developers into Java programmers, who may then create additional software to support Sun products. 'The open-sourcing of this really means more — more richness of offerings, more capability, more applications that consumers will get to use,' Green said. 'The platform itself will become a place for innovation.' All the Java source code is expected to be released by March 2007, Green said. The move covers all Java technology, which includes software that runs on handheld devices, personal computers and servers."

>>1 this is great news. This signifigantly lowers the barrier to entry while maintaining the TCO of my enterprise applications and allows for a smoother information flow throughout my corporate infrastructure.