Converting/Splitting Code - Open to Closed

[Eric Jacobs]

Brian DeSpain <bdespain at valinux.com>

> 
> Yes - but the previous versions licensed under the GPL remain GPLd and
> development can continue on the code.

Can you explain why this is the case?

> > In reality, the code would most likely *fork,* leaving one strand open 
> > and the other proprietary.
> 
> That's exactly what would happen and that's why the GPL is there in the 
> first place. The copyright owner retains copyright, therefore can make 
> changes. You cannot retroactively change licenses under the GPL. People 
> retain their original rights under the GPL.

How can licensees retain their rights against the copyright owner's
will? Is there something in the GPL that requires this?
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