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Montavista has a preview kit which you can download the source from their site. And it is very easy to have propriatary modules in GPL programs let alone having an opensource framework and closedsource UI. Although, it would set PalmSource ahead of the pack if they released their GUI under GPL. I would be less apt to use a closed GUI regardless of whats underneath.

Well, that's all very fine and well for the political market, but releasing the differentiating feature that is what you're really selling (the software portion of the hardware+software total user experience) when it is the only source of your income seems like a rather foolish thing to do. After all, it isn't like PalmSource is selling DBMS and their support, or webservers and their support, or software that's customized to the customer's liking for a fee. An ideology for the sake of ideology is not profitable and isn't likely to make shareholders happy. Besides, whatever became of all the BeOS IP and the engineers that they hired as part of the buyout? It'd be stupid to throw all that away, and not all of that is capable of being made OSS, due to reality being reality. People that refuse to use something that suits their needs at a reasonable price simply because they don't get it "free" even if it is exactly what they need are fools. Use the best tool for the purpose, and don't get too nutty about stupid ideologies that insist people must give away what they create just because others are too damned cheap and lazy.