Quote:
got me to thinking that its justified (though still unfair).

Yeah, that's fair enough. As long as they're the copyright holders for the entire application, they can relicense it however they like, much as the Aladdin Ghostscript folks do. The only slimy thing they did was pretending that their proprietary prerelease licence was the GPL.

Of course if they aren't the copyright holders for the whole application -- if they ever accepted GPL'd patches from third parties with no copyright assignment -- then all they've done is open themselves a whole new can of worms.

Peter