Wow, the Mozilla License (http://www.opensource.org/licenses/mozilla1.0.php) sure looks like it was written by a lawyer being paid by the word. The MIT and BSD licenses (the current BSD license is essentially the same as the MIT license) are a lot more comprehensible, and have served well enough for some of the most significant open source projects out there. One argument I've heard friends make for the MIT/BSD license — quietly, and out of earshot of open source zealots — is that so long as you get clean paperwork from all your contributors, if there's a business case for branching and keeping the branch closed, you can do so without any legal hassles. All other things being equal, keeping your options open sure seems like a better plan to me.