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My point is precisely that selling software is not fundamentally incompatible with sharing source code. And once the source code is shared, you get most of the benefits that people normally associate to open source : ability to know what the software you own does, to point its flaws, to toy with it so as to improve your programming knowledge...
Sure, you can't make an incompatible fork of that software and sell it (like Amazon with Android), nor create a free clone of a commercially supported product (like CentOS with RHEL), but I'm not sure that being able to do that is really a quality of the open source ecosystem. More like a nasty side effect of some people's quest for unconditional software "freedom", in my view. Edited 2013-04-15 17:58 UTC