The art and science of dual licensing
Stefano Comino and Fabio Manenti have written a useful paper [PDF] on dual licensing in open source. It's a decent resource for helping developers and vendors figure out why, if, and how to dual license their software. (See here for a useful explanation of what dual licensing means, and Heather Meeker's piece is a must read for anyone interested in the legal ramifications of the practice.)
I found myself agreeing with much of the authors' conclusions, but not necessarily the tone or conclusion, because they seem to see dual licensing as a way to drive sales. Of course, it sometimes undoubtedly is - for some time a large percentage of MySQL's, Sleepycat's, db4o's, etc. sales were motivated by a proprietary license waiting to "rescue" the OEM/customer from an open source license.… Read more
