Roberto Zicari and his team at Copenhagen Business School have published a good paper to introduce a framework for analysis of Business Models for Open Source Software Products with Dual Licensing, showcasing MySQL and db4objects. http://www.dbis.informatik.uni-frankfurt.de/publications/?mode=view&l=e&tmid=6&smid=23&SID=fa381d4ee4e054ed66e7eb63281b2ea
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