I'm not sure how I feel about MySQL not providing public access to the source code for their enterprise edition – that's why I haven't blogged about it yet.   (They don't legally have to provide the source code to everyone – just the people they provide binaries to.  They also insist that the enterprise code is virtually the same as the community edition but they didn't provide a diff or any guarantees that they'd stay the same.  I guess I just don't see any reason why they wouldn't – if it's really the same, why not?)   I do know that I admire them for publicly posting what they were doing and why.  Kaj Arnö, MySQL's VP of Community, posted their decision in his blog where it is open for public consumption and debate.  That is in the spirit of open source.