On Tue, 13 Sep 2005 01:39:10 -0700, Bert Freudenberg <bert at impara.de>  
wrote:

> So what the folks did at Disney was to carefully distinguish between  
> modifications and enhancements to the "base system" (which were made  
> available publically) and "proprietary additions". Alan also pointed out  
> that if the Squeak License had not have included this requirement to  
> share, nothing done at Disney could have been made public (a feature we  
> will loose when switching to something like the MIT license).
>
> The same distinction is made nowadays at companies using Squeak - we can  
> not share code made for a specific client, but when we fix bugs or  
> otherwise improve the base system, we do publish those changes.

I'm sure I'm missing some subtlety here but isn't that, essentially, GPL?